diff --git a/src/main/java/space/space_spring/controller/PayController.java b/src/main/java/space/space_spring/controller/PayController.java
index adea96b4..efebbfb0 100644
--- a/src/main/java/space/space_spring/controller/PayController.java
+++ b/src/main/java/space/space_spring/controller/PayController.java
@@ -4,14 +4,18 @@
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.web.bind.annotation.*;
 import space.space_spring.argument_resolver.jwtLogin.JwtLoginAuth;
-import space.space_spring.dto.pay.*;
-import space.space_spring.entity.UserSpace;
+import space.space_spring.dto.pay.dto.PayReceiveInfoDto;
+import space.space_spring.dto.pay.dto.PayRequestInfoDto;
+import space.space_spring.dto.pay.dto.PayTargetInfoDto;
+import space.space_spring.dto.pay.dto.TotalPayInfoDto;
+import space.space_spring.dto.pay.request.PostPayCompleteRequest;
+import space.space_spring.dto.pay.request.PostPayCreateRequest;
+import space.space_spring.dto.pay.response.*;
 import space.space_spring.response.BaseResponse;
 import space.space_spring.service.PayService;
 import space.space_spring.util.userSpace.UserSpaceUtils;
 
 import java.util.List;
-import java.util.Optional;
 
 @RestController
 @RequiredArgsConstructor
@@ -47,7 +51,7 @@ private void validateIsUserInSpace(Long userId, Long spaceId) {
     }
 
     /**
-     * 내가 요청한 정산 view
+     * 내가 요청한 정산 조회
      */
     @GetMapping("/space/{spaceId}/pay/request")
     public BaseResponse<GetRequestPayViewResponse> showRequestPayListForUser(@JwtLoginAuth Long userId, @PathVariable Long spaceId) {
@@ -63,6 +67,24 @@ public BaseResponse<GetRequestPayViewResponse> showRequestPayListForUser(@JwtLog
         return new BaseResponse<>(new GetRequestPayViewResponse(payRequestInfoDtoListInComplete, payRequestInfoDtoListComplete));
     }
 
+    /**
+     * 내가 요청받은 정산 조회
+     */
+    @GetMapping("/space/{spaceId}/pay/receive")
+    public BaseResponse<GetReceivePayViewResponse> showReceivePayListForUser(@JwtLoginAuth Long userId, @PathVariable Long spaceId) {
+        // TODO 1. 유저가 스페이스에 속하는 지 검증 -> 추후에 인터셉터에서 처리하게끔 리펙토링 필요
+        validateIsUserInSpace(userId, spaceId);
+
+        // TODO 2. 유저가 요청받은 정산 중 현재 진행중인 정산 리스트 get -> 정산 타겟 유저가 정산 안했을 경우 : isComplete = false
+        List<PayReceiveInfoDto> payReceiveInfoDtoListInComplete = payService.getPayReceiveInfoForUser(userId, spaceId, false);
+
+        // TODO 3. 유저가 요청받은 정산 중 완료한 정산 리스트 get -> 정산 타겟 유저가 정산 했을 경우 : isComplete = true
+        List<PayReceiveInfoDto> payReceiveInfoDtoListComplete = payService.getPayReceiveInfoForUser(userId, spaceId, true);
+
+        return new BaseResponse<>(new GetReceivePayViewResponse(payReceiveInfoDtoListInComplete, payReceiveInfoDtoListComplete));
+    }
+
+
     /**
      * 유저가 최근 정산받은 은행 계좌 정보 조회
      * 해당 api는 유저가 속한 스페이스의 정보가 필요없다고 판단해서 spaceId 를 request로 받지 않음
@@ -92,11 +114,38 @@ public BaseResponse<String> createPay(@JwtLoginAuth Long userId, @PathVariable L
         }
 
         // TODO 3. PostPayCreateRequest의 bankName, bankAccountNum 검증
-        // 이거 해야할까?? 프론트단 분들과 논의 필요
+        // 만약 이걸 해야할 경우, @RequestBody 를 validate 하는 방식으로 검증 수행해야 할 듯
 
         // TODO 4. 정산 생성
         payService.createPay(userId, spaceId, postPayCreateRequest);
 
         return new BaseResponse<>("정산 생성 성공");
     }
+
+    /**
+     * 하나의 정산에 대한 상세정보 조회
+     */
+    @GetMapping("/space/{spaceId}/pay/{payRequestId}")
+    public BaseResponse<TotalPayInfoDto> showTotalPayInfo(@JwtLoginAuth Long userId, @PathVariable Long spaceId, @PathVariable Long payRequestId) {
+
+        // TODO 1. 유저가 스페이스에 속하는 지 검증
+        validateIsUserInSpace(userId, spaceId);
+
+        // TODO 2. 정산 상세 정보 조회
+        return new BaseResponse<>(payService.getTotalPayInfo(spaceId, payRequestId));
+    }
+
+    /**
+     * 정산 타겟 유저의 정산 완료 처리
+     */
+    @PostMapping("/space/{spaceId}/pay/complete")
+    public BaseResponse<PostPayCompleteResponse> setPayComplete(@JwtLoginAuth Long userId, @PathVariable Long spaceId, @RequestBody PostPayCompleteRequest postPayCompleteRequest) {
+
+        // TODO 1. 유저가 스페이스에 속하는 지 검증
+        validateIsUserInSpace(userId, spaceId);
+
+        // TODO 2. 정산 타겟 유저의 정산 완료 처리
+        return new BaseResponse<>(payService.setPayRequestTargetToComplete(postPayCompleteRequest.getPayRequestTargetId()));
+    }
+
 }
diff --git a/src/main/java/space/space_spring/controller/SpaceController.java b/src/main/java/space/space_spring/controller/SpaceController.java
index 057154ce..62b49e63 100644
--- a/src/main/java/space/space_spring/controller/SpaceController.java
+++ b/src/main/java/space/space_spring/controller/SpaceController.java
@@ -5,22 +5,21 @@
 import org.springframework.validation.BindingResult;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
 import space.space_spring.argument_resolver.jwtLogin.JwtLoginAuth;
-import space.space_spring.dto.space.GetUserInfoBySpaceResponse;
-import space.space_spring.dto.space.PostSpaceCreateRequest;
-import space.space_spring.dto.space.PostSpaceCreateResponse;
+import space.space_spring.dto.space.response.GetUserInfoBySpaceResponse;
+import space.space_spring.dto.space.request.PostSpaceCreateRequest;
 
-import space.space_spring.entity.UserSpace;
+import space.space_spring.exception.MultipartFileException;
 import space.space_spring.exception.SpaceException;
 import space.space_spring.response.BaseResponse;
 import space.space_spring.service.S3Uploader;
 import space.space_spring.service.SpaceService;
-import space.space_spring.util.userSpace.UserSpaceUtils;
 
 import java.io.IOException;
-import java.util.Optional;
 
 import static space.space_spring.response.status.BaseExceptionResponseStatus.INVALID_SPACE_CREATE;
+import static space.space_spring.response.status.BaseExceptionResponseStatus.IS_NOT_IMAGE_FILE;
 import static space.space_spring.util.bindingResult.BindingResultUtils.getErrorMessage;
 
 @RestController
@@ -30,33 +29,37 @@
 public class SpaceController {
 
     private final SpaceService spaceService;
-    private final UserSpaceUtils userSpaceUtils;
     private final S3Uploader s3Uploader;
     private final String spaceImgDirName = "spaceImg";
 
-    @PostMapping("/create")
-    public BaseResponse<PostSpaceCreateResponse> createSpace(@JwtLoginAuth Long userId, @Validated @ModelAttribute PostSpaceCreateRequest postSpaceCreateRequest, BindingResult bindingResult) throws IOException {
+    @PostMapping("")
+    public BaseResponse<String> createSpace(@JwtLoginAuth Long userId, @Validated @ModelAttribute PostSpaceCreateRequest postSpaceCreateRequest, BindingResult bindingResult) throws IOException {
         if (bindingResult.hasErrors()) {
             throw new SpaceException(INVALID_SPACE_CREATE, getErrorMessage(bindingResult));
         }
 
         // TODO 1. 스페이스 썸네일을 s3에 upload
-        String spaceImgUrl = s3Uploader.upload(postSpaceCreateRequest.getSpaceProfileImg(), spaceImgDirName);
+        String spaceImgUrl = processSpaceImage(postSpaceCreateRequest.getSpaceProfileImg());
 
         // TODO 2. s3에 저장하고 받은 이미지 url 정보와 spaceName 정보로 space create 작업 수행
-        return new BaseResponse<>(spaceService.createSpace(userId, postSpaceCreateRequest.getSpaceName(), spaceImgUrl));
+        spaceService.createSpace(userId, postSpaceCreateRequest.getSpaceName(), spaceImgUrl);
+
+        return new BaseResponse<>("스페이스 생성 성공");
     }
 
-    /**
-     * 테스트 용
-     */
-    @GetMapping("/{spaceId}")
-    public BaseResponse<String> getSpaceHome(@JwtLoginAuth Long userId, @PathVariable Long spaceId) {
-        Optional<UserSpace> userInSpace = userSpaceUtils.isUserInSpace(userId, spaceId);
-        log.info("userInSpace.get().getUserName() = {}", userInSpace.get().getUserName());
-        log.info("userInspace.get().getUserSpaceAuth() = {}", userInSpace.get().getUserSpaceAuth());
+    private String processSpaceImage(MultipartFile spaceProfileImg) throws IOException {
+        if (spaceProfileImg == null) {
+            return null;
+        }
+        validateImageFile(spaceProfileImg);
+        return s3Uploader.upload(spaceProfileImg, spaceImgDirName);
 
-        return new BaseResponse<>("스페이스에 속한 유저만 걸러내는 작업 테스트 성공");
+    }
+
+    private void validateImageFile(MultipartFile spaceProfileImg) {
+        if (!s3Uploader.isFileImage(spaceProfileImg)) {
+            throw new MultipartFileException(IS_NOT_IMAGE_FILE);
+        }
     }
 
     /**
diff --git a/src/main/java/space/space_spring/controller/UserController.java b/src/main/java/space/space_spring/controller/UserController.java
index fc7f3be9..0a053a27 100644
--- a/src/main/java/space/space_spring/controller/UserController.java
+++ b/src/main/java/space/space_spring/controller/UserController.java
@@ -7,14 +7,14 @@
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 import space.space_spring.argument_resolver.jwtLogin.JwtLoginAuth;
-import space.space_spring.dto.user.*;
+import space.space_spring.dto.user.request.PostUserLoginRequest;
+import space.space_spring.dto.user.request.PostUserSignupRequest;
+import space.space_spring.dto.user.response.GetSpaceInfoForUserResponse;
 import space.space_spring.exception.UserException;
 import space.space_spring.response.BaseResponse;
 import space.space_spring.service.UserService;
 import space.space_spring.util.userSpace.UserSpaceUtils;
 
-import java.util.List;
-
 import static space.space_spring.response.status.BaseExceptionResponseStatus.*;
 import static space.space_spring.util.bindingResult.BindingResultUtils.getErrorMessage;
 
@@ -31,25 +31,29 @@ public class UserController {
      * 회원가입
      */
     @PostMapping("/signup")
-    public BaseResponse<PostUserSignupResponse> signup(@Validated @RequestBody PostUserSignupRequest postUserSignupRequest, BindingResult bindingResult) {
+    public BaseResponse<String> signup(@Validated @RequestBody PostUserSignupRequest postUserSignupRequest, BindingResult bindingResult) {
         if (bindingResult.hasErrors()) {
             throw new UserException(INVALID_USER_SIGNUP, getErrorMessage(bindingResult));
         }
-        return new BaseResponse<>(userService.signup(postUserSignupRequest));
+
+        userService.signup(postUserSignupRequest);
+
+        return new BaseResponse<>("로컬 회원가입 성공");
     }
 
     /**
      * 로그인
      */
     @PostMapping("/login")
-    public BaseResponse<PostUserLoginResponse> login(@Validated @RequestBody PostUserLoginRequest postUserLoginRequest, BindingResult bindingResult, HttpServletResponse response) {
+    public BaseResponse<String> login(@Validated @RequestBody PostUserLoginRequest postUserLoginRequest, BindingResult bindingResult, HttpServletResponse response) {
         if (bindingResult.hasErrors()) {
             throw new UserException(INVALID_USER_LOGIN, getErrorMessage(bindingResult));
         }
 
         String jwtLogin = userService.login(postUserLoginRequest);
         response.setHeader("Authorization", "Bearer " + jwtLogin);
-        return new BaseResponse<>(new PostUserLoginResponse("로그인 성공"));
+
+        return new BaseResponse<>("로컬 로그인 성공");
     }
 
     /**
@@ -61,8 +65,6 @@ public BaseResponse<GetSpaceInfoForUserResponse> showUserSpaceList(@JwtLoginAuth
                                                                        @RequestParam int size,
                                                                        @RequestParam Long lastUserSpaceId) {
 
-        log.info("userId = {}", userId);
-
         return new BaseResponse<>(userService.getSpaceListForUser(userId, size, lastUserSpaceId));
     }
 
diff --git a/src/main/java/space/space_spring/dao/PayDao.java b/src/main/java/space/space_spring/dao/PayDao.java
index a3321288..777c5239 100644
--- a/src/main/java/space/space_spring/dao/PayDao.java
+++ b/src/main/java/space/space_spring/dao/PayDao.java
@@ -4,13 +4,14 @@
 import jakarta.persistence.PersistenceContext;
 import jakarta.persistence.TypedQuery;
 import org.springframework.stereotype.Repository;
-import space.space_spring.dto.pay.RecentPayRequestBankInfoDto;
+import space.space_spring.dto.pay.dto.PayRequestInfoDto;
+import space.space_spring.dto.pay.dto.RecentPayRequestBankInfoDto;
+import space.space_spring.dto.pay.dto.TotalPayInfoDto;
 import space.space_spring.entity.PayRequest;
 import space.space_spring.entity.PayRequestTarget;
 import space.space_spring.entity.Space;
 import space.space_spring.entity.User;
 
-import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -88,4 +89,14 @@ public PayRequestTarget createPayRequestTarget(PayRequest payRequest, Long targe
         em.persist(payRequestTarget);
         return payRequestTarget;
     }
+
+    public PayRequest findPayRequestById(Long payRequestId) {
+
+        return em.find(PayRequest.class, payRequestId);
+    }
+
+    public PayRequestTarget findPayRequestTargetById(Long payRequestTargetId) {
+        return em.find(PayRequestTarget.class, payRequestTargetId);
+    }
+
 }
diff --git a/src/main/java/space/space_spring/dao/SpaceDao.java b/src/main/java/space/space_spring/dao/SpaceDao.java
index 604b23a4..1786868c 100644
--- a/src/main/java/space/space_spring/dao/SpaceDao.java
+++ b/src/main/java/space/space_spring/dao/SpaceDao.java
@@ -4,11 +4,6 @@
 import jakarta.persistence.PersistenceContext;
 import org.springframework.stereotype.Repository;
 import space.space_spring.entity.Space;
-import space.space_spring.entity.User;
-import space.space_spring.entity.UserSpace;
-import space.space_spring.dto.space.PostSpaceCreateRequest;
-
-import static space.space_spring.entity.enumStatus.UserSpaceAuth.MANAGER;
 
 @Repository
 public class SpaceDao {
diff --git a/src/main/java/space/space_spring/dao/UserDao.java b/src/main/java/space/space_spring/dao/UserDao.java
index f38f2846..1814c5b1 100644
--- a/src/main/java/space/space_spring/dao/UserDao.java
+++ b/src/main/java/space/space_spring/dao/UserDao.java
@@ -6,7 +6,6 @@
 import jakarta.persistence.TypedQuery;
 import org.springframework.stereotype.Repository;
 import space.space_spring.entity.User;
-import space.space_spring.dto.user.PostUserSignupRequest;
 import space.space_spring.entity.enumStatus.UserSignupType;
 
 @Repository
diff --git a/src/main/java/space/space_spring/dao/UserSpaceDao.java b/src/main/java/space/space_spring/dao/UserSpaceDao.java
index d89fb717..c02228da 100644
--- a/src/main/java/space/space_spring/dao/UserSpaceDao.java
+++ b/src/main/java/space/space_spring/dao/UserSpaceDao.java
@@ -4,9 +4,9 @@
 import jakarta.persistence.PersistenceContext;
 import jakarta.persistence.TypedQuery;
 import org.springframework.stereotype.Repository;
-import space.space_spring.dto.user.GetSpaceInfoForUserResponse;
-import space.space_spring.dto.user.SpaceChoiceViewDto;
-import space.space_spring.dto.userSpace.UserProfileImgAndNameDto;
+import space.space_spring.dto.user.dto.SpaceChoiceInfo;
+import space.space_spring.dto.user.dto.SpaceChoiceViewDto;
+import space.space_spring.dto.userSpace.UserInfoInSpace;
 import space.space_spring.entity.Space;
 import space.space_spring.entity.User;
 import space.space_spring.entity.UserSpace;
@@ -31,7 +31,7 @@ public UserSpace createUserSpace(User manager, Space saveSpace) {
 
     public Optional<UserSpace> findUserSpaceByUserAndSpace(User user, Space space) {
         TypedQuery<UserSpace> query = em.createQuery(
-                "SELECT us FROM UserSpace us WHERE us.user = :user AND us.space = :space", UserSpace.class);
+                "SELECT us FROM UserSpace us WHERE us.user = :user AND us.space = :space AND us.status = 'ACTIVE'", UserSpace.class);
         query.setParameter("user", user);
         query.setParameter("space", space);
 
@@ -41,7 +41,7 @@ public Optional<UserSpace> findUserSpaceByUserAndSpace(User user, Space space) {
     public SpaceChoiceViewDto getSpaceChoiceView(User userByUserId, int size, Long lastUserSpaceId) {
 
         // 유저가 현재 속해있는 스페이스의 정보만을 return하기 위해 status가 active인 것만 select
-        String jpql = "SELECT us.userSpaceId, s.spaceName, s.spaceProfileImg " +
+        String jpql = "SELECT us.userSpaceId, s.spaceId, s.spaceName, s.spaceProfileImg " +
                 "FROM UserSpace us JOIN us.space s " +
                 "WHERE us.user = :user AND us.status = 'ACTIVE' " +
                 "AND us.userSpaceId > :lastUserSpaceId ORDER BY us.userSpaceId ASC";
@@ -52,41 +52,60 @@ public SpaceChoiceViewDto getSpaceChoiceView(User userByUserId, int size, Long l
         query.setMaxResults(size);
 
         List<Object[]> results = query.getResultList();
-        List<Map<String, String>> responseList = new ArrayList<>();
-        Long newLastUserSpaceId = null;
 
-        for (Object[] result : results) {
-            Long userSpaceId = (Long) result[0];
-            String spaceName = (String) result[1];
-            String spaceProfileImg = (String) result[2];
-            Map<String, String> spaceNameAndProfileImgMap = new HashMap<>();
-            spaceNameAndProfileImgMap.put("spaceName", spaceName);
-            spaceNameAndProfileImgMap.put("spaceProfileImg", spaceProfileImg);
-            responseList.add(spaceNameAndProfileImgMap);
-            newLastUserSpaceId = userSpaceId;
-        }
+        List<SpaceChoiceInfo> spaceChoiceInfoList = mapToSpaceChoiceInfoList(results);
+
+        Long newLastUserSpaceId = determineLastUserSpaceId(results);
+
+        return new SpaceChoiceViewDto(spaceChoiceInfoList, newLastUserSpaceId);
+    }
 
-        // 데이터가 마지막임을 알리기 위해 -1 설정
+    private Long determineLastUserSpaceId(List<Object[]> results) {
         if (results.isEmpty()) {
-            newLastUserSpaceId = -1L;
+            return -1L;             // 더 이상 조회할 데이터가 없음을 표시
         }
+        // results가 비어있지 않다면 마지막 userSpaceId를 반환
+        return (Long) results.get(results.size() - 1)[0];
+    }
+
+    private List<SpaceChoiceInfo> mapToSpaceChoiceInfoList(List<Object[]> results) {
+        List<SpaceChoiceInfo> spaceChoiceInfoList = new ArrayList<>();
+        for (Object[] result : results) {
+            Long spaceId = (Long) result[1];
+            String spaceName = (String) result[2];
+            String spaceProfileImg = (String) result[3];
 
-        return new SpaceChoiceViewDto(responseList, newLastUserSpaceId);
+            SpaceChoiceInfo spaceChoiceInfo = new SpaceChoiceInfo(spaceId, spaceName, spaceProfileImg);
+            spaceChoiceInfoList.add(spaceChoiceInfo);
+        }
+        return spaceChoiceInfoList;
     }
 
-    public List<UserProfileImgAndNameDto> findUserProfileImgAndName(Space space) {
-        String jpql = "SELECT us.userName, us.userProfileImg FROM UserSpace us WHERE us.space = :space";
+    public List<UserInfoInSpace> findUserInfoInSpace(Space space) {
+        String jpql = "SELECT us.user.userId, us.userName, us.userProfileImg, us.userSpaceAuth " +
+                "FROM UserSpace us WHERE us.space = :space";
         TypedQuery<Object[]> query = em.createQuery(jpql, Object[].class);
         query.setParameter("space", space);
 
         List<Object[]> results = query.getResultList();
-        List<UserProfileImgAndNameDto> responseList = new ArrayList<>();
+
+        return mapToUserInfoInSpace(results);
+    }
+
+    private List<UserInfoInSpace> mapToUserInfoInSpace(List<Object[]> results) {
+        List<UserInfoInSpace> userInfoInSpaceList = new ArrayList<>();
+
         for (Object[] result : results) {
-            String userName = (String) result[0];
-            String profileImg = (String) result[1];
-            responseList.add(new UserProfileImgAndNameDto(userName, profileImg));
+            Long userId = (Long) result[0];
+            String userName = (String) result[1];
+            String profileImgUrl = (String) result[2];
+            String userAuth = (String) result[3];
+
+            UserInfoInSpace userInfoInSpace = new UserInfoInSpace(userId, userName, profileImgUrl, userAuth);
+            userInfoInSpaceList.add(userInfoInSpace);
         }
 
-        return responseList;
+        return userInfoInSpaceList;
     }
+
 }
diff --git a/src/main/java/space/space_spring/dto/pay/PayReceiveInfoDto.java b/src/main/java/space/space_spring/dto/pay/dto/PayReceiveInfoDto.java
similarity index 70%
rename from src/main/java/space/space_spring/dto/pay/PayReceiveInfoDto.java
rename to src/main/java/space/space_spring/dto/pay/dto/PayReceiveInfoDto.java
index 0d57aeb2..61146f5a 100644
--- a/src/main/java/space/space_spring/dto/pay/PayReceiveInfoDto.java
+++ b/src/main/java/space/space_spring/dto/pay/dto/PayReceiveInfoDto.java
@@ -1,4 +1,4 @@
-package space.space_spring.dto.pay;
+package space.space_spring.dto.pay.dto;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -7,6 +7,8 @@
 @AllArgsConstructor
 public class PayReceiveInfoDto {
 
+    private Long payRequestTargetId;
+
     private String payCreatorName;
 
     private int requestAmount;
diff --git a/src/main/java/space/space_spring/dto/pay/PayRequestInfoDto.java b/src/main/java/space/space_spring/dto/pay/dto/PayRequestInfoDto.java
similarity index 84%
rename from src/main/java/space/space_spring/dto/pay/PayRequestInfoDto.java
rename to src/main/java/space/space_spring/dto/pay/dto/PayRequestInfoDto.java
index 92dfa440..4c289bd2 100644
--- a/src/main/java/space/space_spring/dto/pay/PayRequestInfoDto.java
+++ b/src/main/java/space/space_spring/dto/pay/dto/PayRequestInfoDto.java
@@ -1,4 +1,4 @@
-package space.space_spring.dto.pay;
+package space.space_spring.dto.pay.dto;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -7,6 +7,8 @@
 @AllArgsConstructor
 public class PayRequestInfoDto {
 
+    private Long payRequestId;
+
     private int totalAmount;            // 정산 총 금액
 
     private int receiveAmount;          // 현재까지 받은 금액
diff --git a/src/main/java/space/space_spring/dto/pay/dto/PayTargetInfoDto.java b/src/main/java/space/space_spring/dto/pay/dto/PayTargetInfoDto.java
new file mode 100644
index 00000000..971e84c3
--- /dev/null
+++ b/src/main/java/space/space_spring/dto/pay/dto/PayTargetInfoDto.java
@@ -0,0 +1,19 @@
+package space.space_spring.dto.pay.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class PayTargetInfoDto {
+
+    private Long targetUserId;
+
+    private String targetUserName;
+
+    private String targetUserProfileImg;
+
+    private int requestAmount;
+
+    private boolean isComplete;
+}
diff --git a/src/main/java/space/space_spring/dto/pay/RecentPayRequestBankInfoDto.java b/src/main/java/space/space_spring/dto/pay/dto/RecentPayRequestBankInfoDto.java
similarity index 83%
rename from src/main/java/space/space_spring/dto/pay/RecentPayRequestBankInfoDto.java
rename to src/main/java/space/space_spring/dto/pay/dto/RecentPayRequestBankInfoDto.java
index 3a540d50..3c070998 100644
--- a/src/main/java/space/space_spring/dto/pay/RecentPayRequestBankInfoDto.java
+++ b/src/main/java/space/space_spring/dto/pay/dto/RecentPayRequestBankInfoDto.java
@@ -1,4 +1,4 @@
-package space.space_spring.dto.pay;
+package space.space_spring.dto.pay.dto;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
diff --git a/src/main/java/space/space_spring/dto/pay/dto/TotalPayInfoDto.java b/src/main/java/space/space_spring/dto/pay/dto/TotalPayInfoDto.java
new file mode 100644
index 00000000..5a2de372
--- /dev/null
+++ b/src/main/java/space/space_spring/dto/pay/dto/TotalPayInfoDto.java
@@ -0,0 +1,31 @@
+package space.space_spring.dto.pay.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+public class TotalPayInfoDto {
+
+    private Long payRequestId;
+
+    private String bankName;
+
+    private String bankAccountNum;
+
+    private int totalAmount;
+
+    private int receiveAmount;
+
+    private int totalTargetNum;
+
+    private int receiveTargetNum;
+
+    private List<PayTargetInfoDto> payTargetInfoDtoList = new ArrayList<>();
+
+    private boolean isComplete;
+
+}
diff --git a/src/main/java/space/space_spring/dto/pay/request/PostPayCompleteRequest.java b/src/main/java/space/space_spring/dto/pay/request/PostPayCompleteRequest.java
new file mode 100644
index 00000000..bfb53dd0
--- /dev/null
+++ b/src/main/java/space/space_spring/dto/pay/request/PostPayCompleteRequest.java
@@ -0,0 +1,14 @@
+package space.space_spring.dto.pay.request;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+public class PostPayCompleteRequest {
+
+    private Long payRequestTargetId;
+
+}
diff --git a/src/main/java/space/space_spring/dto/pay/PostPayCreateRequest.java b/src/main/java/space/space_spring/dto/pay/request/PostPayCreateRequest.java
similarity index 92%
rename from src/main/java/space/space_spring/dto/pay/PostPayCreateRequest.java
rename to src/main/java/space/space_spring/dto/pay/request/PostPayCreateRequest.java
index c50a1a53..295f57fa 100644
--- a/src/main/java/space/space_spring/dto/pay/PostPayCreateRequest.java
+++ b/src/main/java/space/space_spring/dto/pay/request/PostPayCreateRequest.java
@@ -1,4 +1,4 @@
-package space.space_spring.dto.pay;
+package space.space_spring.dto.pay.request;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -6,7 +6,6 @@
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Map;
 
 @Getter
 @NoArgsConstructor
diff --git a/src/main/java/space/space_spring/dto/pay/GetPayViewResponse.java b/src/main/java/space/space_spring/dto/pay/response/GetPayViewResponse.java
similarity index 67%
rename from src/main/java/space/space_spring/dto/pay/GetPayViewResponse.java
rename to src/main/java/space/space_spring/dto/pay/response/GetPayViewResponse.java
index 2d2b7305..a3904f4d 100644
--- a/src/main/java/space/space_spring/dto/pay/GetPayViewResponse.java
+++ b/src/main/java/space/space_spring/dto/pay/response/GetPayViewResponse.java
@@ -1,7 +1,9 @@
-package space.space_spring.dto.pay;
+package space.space_spring.dto.pay.response;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
+import space.space_spring.dto.pay.dto.PayReceiveInfoDto;
+import space.space_spring.dto.pay.dto.PayRequestInfoDto;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/src/main/java/space/space_spring/dto/pay/response/GetReceivePayViewResponse.java b/src/main/java/space/space_spring/dto/pay/response/GetReceivePayViewResponse.java
new file mode 100644
index 00000000..e9f7e3f3
--- /dev/null
+++ b/src/main/java/space/space_spring/dto/pay/response/GetReceivePayViewResponse.java
@@ -0,0 +1,17 @@
+package space.space_spring.dto.pay.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import space.space_spring.dto.pay.dto.PayReceiveInfoDto;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+public class GetReceivePayViewResponse {
+
+    private List<PayReceiveInfoDto> payReceiveInfoDtoListIncomplete = new ArrayList<>();
+
+    private List<PayReceiveInfoDto> payReceiveInfoDtoListComplete = new ArrayList<>();
+}
diff --git a/src/main/java/space/space_spring/dto/pay/GetRecentPayRequestBankInfoResponse.java b/src/main/java/space/space_spring/dto/pay/response/GetRecentPayRequestBankInfoResponse.java
similarity index 72%
rename from src/main/java/space/space_spring/dto/pay/GetRecentPayRequestBankInfoResponse.java
rename to src/main/java/space/space_spring/dto/pay/response/GetRecentPayRequestBankInfoResponse.java
index 42b348d9..2e2f9ef0 100644
--- a/src/main/java/space/space_spring/dto/pay/GetRecentPayRequestBankInfoResponse.java
+++ b/src/main/java/space/space_spring/dto/pay/response/GetRecentPayRequestBankInfoResponse.java
@@ -1,7 +1,8 @@
-package space.space_spring.dto.pay;
+package space.space_spring.dto.pay.response;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
+import space.space_spring.dto.pay.dto.RecentPayRequestBankInfoDto;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/src/main/java/space/space_spring/dto/pay/GetRequestPayViewResponse.java b/src/main/java/space/space_spring/dto/pay/response/GetRequestPayViewResponse.java
similarity index 77%
rename from src/main/java/space/space_spring/dto/pay/GetRequestPayViewResponse.java
rename to src/main/java/space/space_spring/dto/pay/response/GetRequestPayViewResponse.java
index 0ee5860a..82b83ada 100644
--- a/src/main/java/space/space_spring/dto/pay/GetRequestPayViewResponse.java
+++ b/src/main/java/space/space_spring/dto/pay/response/GetRequestPayViewResponse.java
@@ -1,7 +1,8 @@
-package space.space_spring.dto.pay;
+package space.space_spring.dto.pay.response;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
+import space.space_spring.dto.pay.dto.PayRequestInfoDto;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/src/main/java/space/space_spring/dto/pay/response/PostPayCompleteResponse.java b/src/main/java/space/space_spring/dto/pay/response/PostPayCompleteResponse.java
new file mode 100644
index 00000000..e2399a43
--- /dev/null
+++ b/src/main/java/space/space_spring/dto/pay/response/PostPayCompleteResponse.java
@@ -0,0 +1,14 @@
+package space.space_spring.dto.pay.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class PostPayCompleteResponse {
+
+    private Long payRequestId;
+
+    private boolean isComplete;             // 유저가 돈 낸 정산의 완료 여부
+
+}
diff --git a/src/main/java/space/space_spring/dto/space/GetUserInfoBySpaceResponse.java b/src/main/java/space/space_spring/dto/space/GetUserInfoBySpaceResponse.java
deleted file mode 100644
index 4ffbec25..00000000
--- a/src/main/java/space/space_spring/dto/space/GetUserInfoBySpaceResponse.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package space.space_spring.dto.space;
-
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import space.space_spring.dto.userSpace.UserProfileImgAndNameDto;
-
-import java.util.ArrayList;
-import java.util.List;
-
-@Getter
-@AllArgsConstructor
-public class GetUserInfoBySpaceResponse {
-
-    private List<UserProfileImgAndNameDto> userProfileImgAndNameDtoList = new ArrayList<>();
-}
diff --git a/src/main/java/space/space_spring/dto/space/PostSpaceCreateResponse.java b/src/main/java/space/space_spring/dto/space/PostSpaceCreateResponse.java
deleted file mode 100644
index bc0c2031..00000000
--- a/src/main/java/space/space_spring/dto/space/PostSpaceCreateResponse.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package space.space_spring.dto.space;
-
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-
-@Getter
-@AllArgsConstructor
-public class PostSpaceCreateResponse {
-
-    private Long spaceId;
-    private String spaceImgUrl;         // 사진 url이 잘 생성됐는지 확인하는 용도
-}
diff --git a/src/main/java/space/space_spring/dto/space/PostSpaceCreateRequest.java b/src/main/java/space/space_spring/dto/space/request/PostSpaceCreateRequest.java
similarity index 77%
rename from src/main/java/space/space_spring/dto/space/PostSpaceCreateRequest.java
rename to src/main/java/space/space_spring/dto/space/request/PostSpaceCreateRequest.java
index f92e5774..42d7964b 100644
--- a/src/main/java/space/space_spring/dto/space/PostSpaceCreateRequest.java
+++ b/src/main/java/space/space_spring/dto/space/request/PostSpaceCreateRequest.java
@@ -1,12 +1,12 @@
-package space.space_spring.dto.space;
+package space.space_spring.dto.space.request;
 
+import jakarta.annotation.Nullable;
 import jakarta.validation.constraints.NotBlank;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import org.hibernate.validator.constraints.Length;
 import org.springframework.web.multipart.MultipartFile;
-import space.space_spring.validator.ValidFile;
 
 @Getter
 @Setter
@@ -17,6 +17,6 @@ public class PostSpaceCreateRequest {
     @NotBlank(message = "스페이스 이름은 공백일 수 없습니다.")
     private String spaceName;
 
-    @ValidFile(message = "스페이스 프로필 이미지는 공백일 수 없습니다.")
+    @Nullable
     private MultipartFile spaceProfileImg;         // 스페이스 프로필 이미지 (썸네일)
 }
diff --git a/src/main/java/space/space_spring/dto/space/response/GetUserInfoBySpaceResponse.java b/src/main/java/space/space_spring/dto/space/response/GetUserInfoBySpaceResponse.java
new file mode 100644
index 00000000..726d158e
--- /dev/null
+++ b/src/main/java/space/space_spring/dto/space/response/GetUserInfoBySpaceResponse.java
@@ -0,0 +1,15 @@
+package space.space_spring.dto.space.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import space.space_spring.dto.userSpace.UserInfoInSpace;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+public class GetUserInfoBySpaceResponse {
+
+    private List<UserInfoInSpace> userInfoInSpaceList = new ArrayList<>();
+}
diff --git a/src/main/java/space/space_spring/dto/user/PostUserLoginResponse.java b/src/main/java/space/space_spring/dto/user/PostUserLoginResponse.java
deleted file mode 100644
index 29b631c5..00000000
--- a/src/main/java/space/space_spring/dto/user/PostUserLoginResponse.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package space.space_spring.dto.user;
-
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-
-@Getter
-@AllArgsConstructor
-public class PostUserLoginResponse {
-
-    private String successMsg;
-}
diff --git a/src/main/java/space/space_spring/dto/user/PostUserSignupResponse.java b/src/main/java/space/space_spring/dto/user/PostUserSignupResponse.java
deleted file mode 100644
index 6d34b743..00000000
--- a/src/main/java/space/space_spring/dto/user/PostUserSignupResponse.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package space.space_spring.dto.user;
-
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-
-@Getter
-@AllArgsConstructor
-public class PostUserSignupResponse {
-
-    private Long userId;
-}
diff --git a/src/main/java/space/space_spring/dto/user/dto/SpaceChoiceInfo.java b/src/main/java/space/space_spring/dto/user/dto/SpaceChoiceInfo.java
new file mode 100644
index 00000000..c62eb499
--- /dev/null
+++ b/src/main/java/space/space_spring/dto/user/dto/SpaceChoiceInfo.java
@@ -0,0 +1,15 @@
+package space.space_spring.dto.user.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class SpaceChoiceInfo {
+
+    private Long spaceId;
+
+    private String spaceName;
+
+    private String profileImgUrl;
+}
\ No newline at end of file
diff --git a/src/main/java/space/space_spring/dto/user/SpaceChoiceViewDto.java b/src/main/java/space/space_spring/dto/user/dto/SpaceChoiceViewDto.java
similarity index 59%
rename from src/main/java/space/space_spring/dto/user/SpaceChoiceViewDto.java
rename to src/main/java/space/space_spring/dto/user/dto/SpaceChoiceViewDto.java
index 381db4da..64f58dbe 100644
--- a/src/main/java/space/space_spring/dto/user/SpaceChoiceViewDto.java
+++ b/src/main/java/space/space_spring/dto/user/dto/SpaceChoiceViewDto.java
@@ -1,15 +1,16 @@
-package space.space_spring.dto.user;
+package space.space_spring.dto.user.dto;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 
 import java.util.List;
-import java.util.Map;
 
 @Getter
 @AllArgsConstructor
 public class SpaceChoiceViewDto {
 
-    private List<Map<String, String>> spaceNameAndProfileImgList;
+    private List<SpaceChoiceInfo> spaceChoiceInfoList;
+
     private Long lastUserSpaceId;
+
 }
diff --git a/src/main/java/space/space_spring/dto/user/PostUserLoginRequest.java b/src/main/java/space/space_spring/dto/user/request/PostUserLoginRequest.java
similarity index 72%
rename from src/main/java/space/space_spring/dto/user/PostUserLoginRequest.java
rename to src/main/java/space/space_spring/dto/user/request/PostUserLoginRequest.java
index 69f8768f..763beb83 100644
--- a/src/main/java/space/space_spring/dto/user/PostUserLoginRequest.java
+++ b/src/main/java/space/space_spring/dto/user/request/PostUserLoginRequest.java
@@ -1,4 +1,4 @@
-package space.space_spring.dto.user;
+package space.space_spring.dto.user.request;
 
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.Pattern;
@@ -11,7 +11,8 @@
 @NoArgsConstructor
 public class PostUserLoginRequest {
 
-    @Pattern(regexp = "^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,6}$", message = "이메일 형식에 맞지 않습니다.")     // 이메일 정규표현식 확인 필요함
+    // '@', '.' 이 있어야 함
+    @Pattern(regexp = "^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}$", message = "이메일 형식에 맞지 않습니다.")
     @NotBlank
     private String email;
 
diff --git a/src/main/java/space/space_spring/dto/user/PostUserSignupRequest.java b/src/main/java/space/space_spring/dto/user/request/PostUserSignupRequest.java
similarity index 79%
rename from src/main/java/space/space_spring/dto/user/PostUserSignupRequest.java
rename to src/main/java/space/space_spring/dto/user/request/PostUserSignupRequest.java
index c483849d..982a5ce1 100644
--- a/src/main/java/space/space_spring/dto/user/PostUserSignupRequest.java
+++ b/src/main/java/space/space_spring/dto/user/request/PostUserSignupRequest.java
@@ -1,4 +1,4 @@
-package space.space_spring.dto.user;
+package space.space_spring.dto.user.request;
 
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.Pattern;
@@ -14,7 +14,8 @@
 @AllArgsConstructor
 public class PostUserSignupRequest {
 
-    @Pattern(regexp = "^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,6}$", message = "이메일 형식에 맞지 않습니다.")     // 이메일 정규표현식 확인 필요함
+    // '@', '.' 이 있어야 함
+    @Pattern(regexp = "^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}$", message = "이메일 형식에 맞지 않습니다.")
     @NotBlank
     private String email;
 
diff --git a/src/main/java/space/space_spring/dto/user/GetSpaceInfoForUserResponse.java b/src/main/java/space/space_spring/dto/user/response/GetSpaceInfoForUserResponse.java
similarity index 59%
rename from src/main/java/space/space_spring/dto/user/GetSpaceInfoForUserResponse.java
rename to src/main/java/space/space_spring/dto/user/response/GetSpaceInfoForUserResponse.java
index 053b77e0..86f73c48 100644
--- a/src/main/java/space/space_spring/dto/user/GetSpaceInfoForUserResponse.java
+++ b/src/main/java/space/space_spring/dto/user/response/GetSpaceInfoForUserResponse.java
@@ -1,11 +1,10 @@
-package space.space_spring.dto.user;
+package space.space_spring.dto.user.response;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
-import lombok.Setter;
+import space.space_spring.dto.user.dto.SpaceChoiceInfo;
 
 import java.util.List;
-import java.util.Map;
 
 @Getter
 @AllArgsConstructor
@@ -15,6 +14,6 @@ public class GetSpaceInfoForUserResponse {
 
     private Long lastUserSpaceId;
 
-    private List<Map<String, String>> spaceInfoList;
+    private List<SpaceChoiceInfo> spaceInfoList;
 
 }
\ No newline at end of file
diff --git a/src/main/java/space/space_spring/dto/userSpace/UserProfileImgAndNameDto.java b/src/main/java/space/space_spring/dto/userSpace/UserInfoInSpace.java
similarity index 53%
rename from src/main/java/space/space_spring/dto/userSpace/UserProfileImgAndNameDto.java
rename to src/main/java/space/space_spring/dto/userSpace/UserInfoInSpace.java
index ab17cd9b..865007d2 100644
--- a/src/main/java/space/space_spring/dto/userSpace/UserProfileImgAndNameDto.java
+++ b/src/main/java/space/space_spring/dto/userSpace/UserInfoInSpace.java
@@ -5,9 +5,13 @@
 
 @Getter
 @AllArgsConstructor
-public class UserProfileImgAndNameDto {
+public class UserInfoInSpace {
 
-    private String profileImgUrl;
+    private Long userId;
 
     private String userName;
+
+    private String profileImgUrl;
+
+    private String userAuth;                // 해당 스페이스에서의 유저 권한 (manager vs normal)
 }
diff --git a/src/main/java/space/space_spring/entity/PayRequest.java b/src/main/java/space/space_spring/entity/PayRequest.java
index 2b0030c6..d921b7df 100644
--- a/src/main/java/space/space_spring/entity/PayRequest.java
+++ b/src/main/java/space/space_spring/entity/PayRequest.java
@@ -41,4 +41,8 @@ public void savePayRequest(User payCreateUser, Space space, int totalAmount, Str
         this.bankAccountNum = bankAccountNum;
         this.isComplete = isComplete;
     }
+
+    public void changeCompleteStatus(boolean isComplete) {
+        this.isComplete = isComplete;
+    }
 }
diff --git a/src/main/java/space/space_spring/entity/PayRequestTarget.java b/src/main/java/space/space_spring/entity/PayRequestTarget.java
index e2c8d8e1..c2495833 100644
--- a/src/main/java/space/space_spring/entity/PayRequestTarget.java
+++ b/src/main/java/space/space_spring/entity/PayRequestTarget.java
@@ -31,4 +31,8 @@ public void savePayRequestTarget(PayRequest payRequest, Long targetUserId, int r
         this.requestAmount = requestAmount;
         this.isComplete = isComplete;
     }
+
+    public void changeCompleteStatus(boolean isComplete) {
+        this.isComplete = isComplete;
+    }
 }
diff --git a/src/main/java/space/space_spring/exception/MultipartFileException.java b/src/main/java/space/space_spring/exception/MultipartFileException.java
new file mode 100644
index 00000000..3292f14a
--- /dev/null
+++ b/src/main/java/space/space_spring/exception/MultipartFileException.java
@@ -0,0 +1,20 @@
+package space.space_spring.exception;
+
+import lombok.Getter;
+import space.space_spring.response.status.ResponseStatus;
+
+@Getter
+public class MultipartFileException extends RuntimeException {
+
+    private final ResponseStatus exceptionStatus;
+
+    public MultipartFileException(ResponseStatus exceptionStatus) {
+        super(exceptionStatus.getMessage());
+        this.exceptionStatus = exceptionStatus;
+    }
+
+    public MultipartFileException(ResponseStatus exceptionStatus, String message) {
+        super(message);
+        this.exceptionStatus = exceptionStatus;
+    }
+}
diff --git a/src/main/java/space/space_spring/response/status/BaseExceptionResponseStatus.java b/src/main/java/space/space_spring/response/status/BaseExceptionResponseStatus.java
index 0e2e52d3..3999db2c 100644
--- a/src/main/java/space/space_spring/response/status/BaseExceptionResponseStatus.java
+++ b/src/main/java/space/space_spring/response/status/BaseExceptionResponseStatus.java
@@ -76,8 +76,12 @@ public enum BaseExceptionResponseStatus implements ResponseStatus {
     /**
      * 8000: Chat 오류
      */
-    INVALID_CHATROOM_CREATE(8000, HttpStatus.BAD_REQUEST.value(), "채팅방 생성 요청에서 잘못된 값이 존재합니다.");
+    INVALID_CHATROOM_CREATE(8000, HttpStatus.BAD_REQUEST.value(), "채팅방 생성 요청에서 잘못된 값이 존재합니다."),
 
+    /**
+     * 9000 : MultipartFile 오류
+     */
+    IS_NOT_IMAGE_FILE(9000, HttpStatus.BAD_REQUEST.value(), "지원되는 이미지 파일의 형식이 아닙니다.");
 
     private final int code;
     private final int status;
diff --git a/src/main/java/space/space_spring/service/PayService.java b/src/main/java/space/space_spring/service/PayService.java
index 6bade187..35e80e8b 100644
--- a/src/main/java/space/space_spring/service/PayService.java
+++ b/src/main/java/space/space_spring/service/PayService.java
@@ -4,17 +4,22 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import space.space_spring.dao.PayDao;
-import space.space_spring.dto.pay.*;
-import space.space_spring.entity.PayRequest;
-import space.space_spring.entity.PayRequestTarget;
-import space.space_spring.entity.Space;
-import space.space_spring.entity.User;
+import space.space_spring.dao.UserDao;
+import space.space_spring.dao.UserSpaceDao;
+import space.space_spring.dto.pay.dto.*;
+import space.space_spring.dto.pay.request.PostPayCreateRequest;
+import space.space_spring.dto.pay.response.GetRecentPayRequestBankInfoResponse;
+import space.space_spring.dto.pay.response.PostPayCompleteResponse;
+import space.space_spring.entity.*;
+import space.space_spring.exception.UserSpaceException;
 import space.space_spring.util.space.SpaceUtils;
 import space.space_spring.util.user.UserUtils;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Map;
+import java.util.Optional;
+
+import static space.space_spring.response.status.BaseExceptionResponseStatus.USER_IS_NOT_IN_SPACE;
 
 @Service
 @RequiredArgsConstructor
@@ -23,6 +28,8 @@ public class PayService {
     private final PayDao payDao;
     private final UserUtils userUtils;
     private final SpaceUtils spaceUtils;
+    private final UserDao userDao;
+    private final UserSpaceDao userSpaceDao;
 
     @Transactional
     public List<PayRequestInfoDto> getPayRequestInfoForUser(Long userId, Long spaceId, boolean isComplete) {
@@ -36,34 +43,43 @@ public List<PayRequestInfoDto> getPayRequestInfoForUser(Long userId, Long spaceI
         List<PayRequest> payRequestListByUser = payDao.findPayRequestListByUser(userByUserId, spaceBySpaceId, isComplete);
 
         // TODO 4. return 타입 구성
+        // <PayRequest의 receiveAmount 값을 저장할 수 있도록 다오단에 코드를 추가해야할 것 같음>
+
         // 3-1. 각 payRequest 에 해당하는 모든 payRequestTarget 을 loop로 돌면서 데이터 수집
         List<PayRequestInfoDto> payRequestInfoDtoList = new ArrayList<>();
 
         for (PayRequest payRequest : payRequestListByUser) {
-            // 하나의 정산 요청에 대하여 ,,,
-            int totalAmount = payRequest.getTotalAmount();
-            int receiveAmount = 0;
-            int totalTargetNum = 0;
-            int receiveTargetNum = 0;
-
-            List<PayRequestTarget> payRequestTargetList = payDao.findPayRequestTargetListByPayRequest(payRequest);
-            for (PayRequestTarget payRequestTarget : payRequestTargetList) {
-                if (payRequestTarget.isComplete()) {
-                    // 해당 타겟이 돈을 낸 경우
-                    receiveAmount += payRequestTarget.getRequestAmount();
-                    receiveTargetNum++;
-                }
-
-                totalTargetNum++;
-            }
-
-            PayRequestInfoDto payRequestInfoDto = new PayRequestInfoDto(totalAmount, receiveAmount, totalTargetNum, receiveTargetNum);
+            PayRequestInfoDto payRequestInfoDto = createPayRequestInfoDto(payRequest);
             payRequestInfoDtoList.add(payRequestInfoDto);
         }
 
         return payRequestInfoDtoList;
     }
 
+    private PayRequestInfoDto createPayRequestInfoDto(PayRequest payRequest) {
+        Long payRequestId = payRequest.getPayRequestId();
+        int totalAmount = payRequest.getTotalAmount();
+        int receiveAmount = 0;
+        int totalTargetNum = 0;
+        int receiveTargetNum = 0;
+
+        List<PayRequestTarget> payRequestTargetList = payDao.findPayRequestTargetListByPayRequest(payRequest);
+
+        for (PayRequestTarget payRequestTarget : payRequestTargetList) {
+            if (payRequestTarget.isComplete()) {
+                // 해당 타겟이 돈을 낸 경우
+                receiveAmount += payRequestTarget.getRequestAmount();
+                receiveTargetNum++;
+            }
+
+            totalTargetNum++;
+        }
+
+        return new PayRequestInfoDto(
+                payRequestId, totalAmount, receiveAmount, totalTargetNum, receiveTargetNum
+        );
+    }
+
     @Transactional
     public List<PayReceiveInfoDto> getPayReceiveInfoForUser(Long userId, Long spaceId, boolean isComplete) {
         // TODO 1. userId에 해당하는 유저 find
@@ -80,17 +96,20 @@ public List<PayReceiveInfoDto> getPayReceiveInfoForUser(Long userId, Long spaceI
         List<PayReceiveInfoDto> payReceiveInfoDtoList = new ArrayList<>();
 
         for (PayRequestTarget payRequestTarget : payRequestTargetListByUser) {
-            String payCreatorName = payRequestTarget.getPayRequest().getPayCreateUser().getUserName();          // 리펙토링 필요
-            int requestAmount = payRequestTarget.getRequestAmount();
-
-            PayReceiveInfoDto payReceiveInfoDto = new PayReceiveInfoDto(payCreatorName, requestAmount);
-
+            PayReceiveInfoDto payReceiveInfoDto = createPayReceiveInfoDto(payRequestTarget);
             payReceiveInfoDtoList.add(payReceiveInfoDto);
         }
 
         return payReceiveInfoDtoList;
     }
 
+    private PayReceiveInfoDto createPayReceiveInfoDto(PayRequestTarget payRequestTarget) {
+        String payCreatorName = payRequestTarget.getPayRequest().getPayCreateUser().getUserName();          // 리펙토링 필요
+        int requestAmount = payRequestTarget.getRequestAmount();
+
+        return new PayReceiveInfoDto(payRequestTarget.getPayRequestTargetId(), payCreatorName, requestAmount);
+    }
+
     @Transactional
     public GetRecentPayRequestBankInfoResponse getRecentPayRequestBankInfoForUser(Long userId) {
         // TODO 1. userId에 해당하는 유저 find
@@ -124,5 +143,97 @@ public List<PayRequestTarget> createPay(Long userId, Long spaceId, PostPayCreate
         return resultList;
     }
 
+    /**
+     * 하나의 정산에 대한 상세정보 조회
+     */
+    @Transactional
+    public TotalPayInfoDto getTotalPayInfo(Long spaceId, Long payRequestId) {
+        // TODO 1. spaceId로 Space 엔티티 find
+        Space spaceBySpaceId = spaceUtils.findSpaceBySpaceId(spaceId);
+
+        // TODO 2. payRequestId 로 PayRequest 엔티티 find
+        PayRequest payRequestById = payDao.findPayRequestById(payRequestId);
+
+        // TODO 3. PayRequest로 해당 정산의 정보 get
+        PayRequestInfoDto payRequestInfoDto = createPayRequestInfoDto(payRequestById);
+
+        // TODO 4. PayRequest의 PayRequestTarget find
+        List<PayRequestTarget> payRequestTargetListByPayRequest = payDao.findPayRequestTargetListByPayRequest(payRequestById);
+
+        // TODO 5. 정산 타겟 유저 정보 get
+        List<PayTargetInfoDto> payTargetInfoDtoList = new ArrayList<>();
+        for (PayRequestTarget payRequestTarget : payRequestTargetListByPayRequest) {
+            PayTargetInfoDto payTargetInfoDto = createPayTargetInfoDto(payRequestTarget, spaceBySpaceId);
+            payTargetInfoDtoList.add(payTargetInfoDto);
+        }
+
+        // TODO 6. return 타입 구성
+        return new TotalPayInfoDto(
+                payRequestId,
+                payRequestById.getBankName(),
+                payRequestById.getBankAccountNum(),
+                payRequestById.getTotalAmount(),
+                payRequestInfoDto.getReceiveAmount(),
+                payRequestInfoDto.getTotalTargetNum(),
+                payRequestInfoDto.getReceiveTargetNum(),
+                payTargetInfoDtoList,
+                payRequestById.isComplete()
+        );
+    }
+
+    private PayTargetInfoDto createPayTargetInfoDto(PayRequestTarget payRequestTarget, Space space) {
+        Long targetUserId = payRequestTarget.getTargetUserId();
+        User userByUserId = userDao.findUserByUserId(targetUserId);
+
+        UserSpace userSpace = userSpaceDao.findUserSpaceByUserAndSpace(userByUserId, space)
+                .orElseThrow(() -> new UserSpaceException(USER_IS_NOT_IN_SPACE));
+
+        String userName = userSpace.getUserName();
+        String userProfileImg = userSpace.getUserProfileImg();
+
+        return new PayTargetInfoDto(
+                payRequestTarget.getTargetUserId(),
+                userName,
+                userProfileImg,
+                payRequestTarget.getRequestAmount(),
+                payRequestTarget.isComplete()
+        );
+    }
+
+    /**
+     * 정산 타겟 유저의 정산 완료 처리
+     */
+    @Transactional
+    public PostPayCompleteResponse setPayRequestTargetToComplete(Long payRequestTargetId) {
+
+        // TODO 1. payRequestTargetId로 PayRequestTarget find
+        PayRequestTarget payRequestTargetById = payDao.findPayRequestTargetById(payRequestTargetId);
+
+        // TODO 2. 해당 PayRequestTarget 정산 완료 처리
+        payRequestTargetById.changeCompleteStatus(true);
+
+        // TODO 3. PayRequest의 완료 여부 파악
+        PayRequest payRequest = payRequestTargetById.getPayRequest();
+        boolean payRequestCompleteStatus = isPayRequestComplete(payRequest);
+        if (payRequestCompleteStatus) {
+            payRequest.changeCompleteStatus(true);
+        }
+
+        // TODO 4. return 타입 구성
+        return new PostPayCompleteResponse(
+                payRequest.getPayRequestId(),
+                payRequestCompleteStatus
+        );
+    }
+
+    private boolean isPayRequestComplete(PayRequest payRequest) {
+        List<PayRequestTarget> payRequestTargetListByPayRequest = payDao.findPayRequestTargetListByPayRequest(payRequest);
+        for (PayRequestTarget payRequestTarget : payRequestTargetListByPayRequest) {
+            if (!payRequestTarget.isComplete()) {
+                return false;
+            }
+        }
 
+        return true;
+    }
 }
diff --git a/src/main/java/space/space_spring/service/S3Uploader.java b/src/main/java/space/space_spring/service/S3Uploader.java
index 3fa8e348..1eb4eb17 100644
--- a/src/main/java/space/space_spring/service/S3Uploader.java
+++ b/src/main/java/space/space_spring/service/S3Uploader.java
@@ -9,6 +9,7 @@
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;
+import space.space_spring.validator.AllowedImageFileExtensions;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -26,7 +27,7 @@ public class S3Uploader {
     private String bucket;
 
     //MultipartFile을 전달 받아 File로 전환 후 S3 업로드
-    public  String upload(MultipartFile multipartFile, String dirName) throws IOException{// dirName의 디렉토리가 S3 Bucket 내부에 생성됨
+    public String upload(MultipartFile multipartFile, String dirName) throws IOException{// dirName의 디렉토리가 S3 Bucket 내부에 생성됨
 
         File uploadFile = convert(multipartFile).orElseThrow(()-> new IllegalArgumentException("MultipartFile -> File 전환 실패"));
         //System.out.p
@@ -64,4 +65,14 @@ private Optional<File> convert(MultipartFile file) throws  IOException {
         }
         return Optional.empty();
     }
+
+    // MultipartFile이 지원하는 이미지 파일 형식인지 검증
+    public boolean isFileImage(MultipartFile file) {
+        String fileName = file.getOriginalFilename();
+        String extension = fileName.substring(fileName.lastIndexOf(".") + 1);
+
+        log.info("extension : {}", extension);
+
+        return AllowedImageFileExtensions.contains(extension);
+    }
 }
diff --git a/src/main/java/space/space_spring/service/SpaceService.java b/src/main/java/space/space_spring/service/SpaceService.java
index f17c12f8..92972ced 100644
--- a/src/main/java/space/space_spring/service/SpaceService.java
+++ b/src/main/java/space/space_spring/service/SpaceService.java
@@ -6,15 +6,12 @@
 import space.space_spring.dao.SpaceDao;
 import space.space_spring.dao.UserDao;
 import space.space_spring.dao.UserSpaceDao;
-import space.space_spring.dto.space.GetUserInfoBySpaceResponse;
-import space.space_spring.dto.space.PostSpaceCreateResponse;
+import space.space_spring.dto.space.response.GetUserInfoBySpaceResponse;
 import space.space_spring.entity.Space;
 import space.space_spring.entity.User;
-import space.space_spring.dto.space.PostSpaceCreateRequest;
 import space.space_spring.entity.UserSpace;
 import space.space_spring.util.space.SpaceUtils;
 
-import java.util.List;
 
 @Service
 @RequiredArgsConstructor
@@ -26,7 +23,7 @@ public class SpaceService {
     private final SpaceUtils spaceUtils;
 
     @Transactional
-    public PostSpaceCreateResponse createSpace(Long userId, String spaceName, String spaceImgUrl) {
+    public Long createSpace(Long userId, String spaceName, String spaceImgUrl) {
 
         // TODO 1. 스페이스 생성 정보 db insert
         Space saveSpace = spaceDao.saveSpace(spaceName, spaceImgUrl);
@@ -35,7 +32,7 @@ public PostSpaceCreateResponse createSpace(Long userId, String spaceName, String
         User manager = userDao.findUserByUserId(userId);
         UserSpace userSpace = userSpaceDao.createUserSpace(manager, saveSpace);
 
-        return new PostSpaceCreateResponse(saveSpace.getSpaceId(), spaceImgUrl);
+        return saveSpace.getSpaceId();
     }
 
     @Transactional
@@ -44,6 +41,6 @@ public GetUserInfoBySpaceResponse findUserInfoBySpace(Long spaceId) {
         Space spaceBySpaceId = spaceUtils.findSpaceBySpaceId(spaceId);
 
         // TODO 2. 스페이스의 모든 유저 정보 return
-        return new GetUserInfoBySpaceResponse(userSpaceDao.findUserProfileImgAndName(spaceBySpaceId));
+        return new GetUserInfoBySpaceResponse(userSpaceDao.findUserInfoInSpace(spaceBySpaceId));
     }
 }
diff --git a/src/main/java/space/space_spring/service/UserService.java b/src/main/java/space/space_spring/service/UserService.java
index 551e5720..1b712feb 100644
--- a/src/main/java/space/space_spring/service/UserService.java
+++ b/src/main/java/space/space_spring/service/UserService.java
@@ -5,7 +5,10 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import space.space_spring.dao.UserSpaceDao;
-import space.space_spring.dto.user.*;
+import space.space_spring.dto.user.dto.SpaceChoiceViewDto;
+import space.space_spring.dto.user.request.PostUserLoginRequest;
+import space.space_spring.dto.user.request.PostUserSignupRequest;
+import space.space_spring.dto.user.response.GetSpaceInfoForUserResponse;
 import space.space_spring.entity.enumStatus.UserSignupType;
 import space.space_spring.jwt.JwtLoginProvider;
 import space.space_spring.dao.UserDao;
@@ -27,7 +30,7 @@ public class UserService {
     private final UserUtils userUtils;
 
     @Transactional
-    public PostUserSignupResponse signup(PostUserSignupRequest postUserSignupRequest) {
+    public Long signup(PostUserSignupRequest postUserSignupRequest) {
         // TODO 1. 이메일 중복 검사(아이디 중복 검사)
         validateEmailForLocalSignup(postUserSignupRequest.getEmail());
 
@@ -40,7 +43,7 @@ public PostUserSignupResponse signup(PostUserSignupRequest postUserSignupRequest
 
         User saveUser = userDao.saveUser(email, password, userName, LOCAL);
 
-        return new PostUserSignupResponse(saveUser.getUserId());
+        return saveUser.getUserId();
     }
 
     private void validateEmailForLocalSignup(String email) {
@@ -76,23 +79,14 @@ public GetSpaceInfoForUserResponse getSpaceListForUser(Long userId, int size, Lo
         // TODO 1. userId로 User find
         User userByUserId = userUtils.findUserByUserId(userId);
 
-        // TODO 2. user가 속한 스페이스가 없는 경우 -> 예외처리 ??
-        // (현재 lastUserSpaceId가 -1 & 스페이스 info list는 빈 껍데기로 response가 전달됨)
-        validateSpaceListForUser(userByUserId);
-
-        // TODO 3. 특정 유저가 속해있는 스페이스 정보들을 get -> 무한 스크롤 구현
+        // TODO 2. 특정 유저가 속해있는 스페이스 정보들을 get -> 무한 스크롤 구현
         SpaceChoiceViewDto spaceChoiceViewDto = userSpaceDao.getSpaceChoiceView(userByUserId, size, lastUserSpaceId);
 
-        // TODO 4. find userName
+        // TODO 3. find userName
         String userName = userByUserId.getUserName();
 
-        // TODO 5. return
-        return new GetSpaceInfoForUserResponse(userName, spaceChoiceViewDto.getLastUserSpaceId(), spaceChoiceViewDto.getSpaceNameAndProfileImgList());
-    }
-
-    private void validateSpaceListForUser(User userByUserId) {
-        // 프론트 개발자 분들과 상의해서 결정해야할 거 같음
-
+        // TODO 4. return
+        return new GetSpaceInfoForUserResponse(userName, spaceChoiceViewDto.getLastUserSpaceId(), spaceChoiceViewDto.getSpaceChoiceInfoList());
     }
 
 }
diff --git a/src/main/java/space/space_spring/validator/AllowedImageFileExtensions.java b/src/main/java/space/space_spring/validator/AllowedImageFileExtensions.java
new file mode 100644
index 00000000..b863798d
--- /dev/null
+++ b/src/main/java/space/space_spring/validator/AllowedImageFileExtensions.java
@@ -0,0 +1,35 @@
+package space.space_spring.validator;
+
+import lombok.Getter;
+
+@Getter
+public enum AllowedImageFileExtensions {
+    /**
+     * 허용가능한 이미지 파일 확장자 list
+     */
+    JPEG("jpeg"),
+    JPG("jpg"),
+    PNG("png"),
+    GIF("gif"),
+    WebP("webp"),
+    SVG("svg"),
+    BMP("bmp"),
+    TIF("tif"),
+    TIFF("tiff"),
+    HEIC("heic");
+
+    private String extension;
+
+    AllowedImageFileExtensions(String extension) {
+        this.extension = extension;
+    }
+
+    public static boolean contains(String extension) {
+        for (AllowedImageFileExtensions allowedImageFileExtensions : AllowedImageFileExtensions.values()) {
+            if (allowedImageFileExtensions.getExtension().equals(extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/src/main/java/space/space_spring/validator/ValidFile.java b/src/main/java/space/space_spring/validator/ValidFile.java
deleted file mode 100644
index 6981573c..00000000
--- a/src/main/java/space/space_spring/validator/ValidFile.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package space.space_spring.validator;
-
-import jakarta.validation.Constraint;
-import jakarta.validation.Payload;
-
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-
-@Target(ElementType.FIELD)
-@Retention(RetentionPolicy.RUNTIME)
-@Constraint(validatedBy = ValidFileValidator.class)
-public @interface ValidFile {
-    String message() default "유효하지 않은 파일입니다.";
-    Class<?>[] groups() default {};
-    Class<? extends Payload>[] payload() default {};
-}
diff --git a/src/main/java/space/space_spring/validator/ValidFileValidator.java b/src/main/java/space/space_spring/validator/ValidFileValidator.java
deleted file mode 100644
index 73f814b9..00000000
--- a/src/main/java/space/space_spring/validator/ValidFileValidator.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package space.space_spring.validator;
-
-import jakarta.validation.ConstraintValidator;
-import jakarta.validation.ConstraintValidatorContext;
-import org.springframework.web.multipart.MultipartFile;
-
-public class ValidFileValidator implements ConstraintValidator<ValidFile, MultipartFile> {
-
-    // multipartFile이 null 이 아니거나 비어있지 않으면 검증로직 통과
-    @Override
-    public boolean isValid(MultipartFile multipartFile, ConstraintValidatorContext constraintValidatorContext) {
-        return multipartFile != null && !multipartFile.isEmpty();
-    }
-}
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index fbe4dd4f..fb5e0036 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -107,4 +107,10 @@ spring:
   messages:
     basename: errors
 
+---
 
+spring:
+  servlet:
+    multipart:
+      max-file-size: 5MB
+      max-request-size: 5MB
\ No newline at end of file
diff --git a/src/test/java/space/space_spring/service/PayServiceTest.java b/src/test/java/space/space_spring/service/PayServiceTest.java
index 9dcddfdd..777228eb 100644
--- a/src/test/java/space/space_spring/service/PayServiceTest.java
+++ b/src/test/java/space/space_spring/service/PayServiceTest.java
@@ -8,9 +8,9 @@
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 import space.space_spring.dao.PayDao;
-import space.space_spring.dto.pay.PayReceiveInfoDto;
-import space.space_spring.dto.pay.PayRequestInfoDto;
-import space.space_spring.dto.pay.PostPayCreateRequest;
+import space.space_spring.dto.pay.dto.PayReceiveInfoDto;
+import space.space_spring.dto.pay.dto.PayRequestInfoDto;
+import space.space_spring.dto.pay.request.PostPayCreateRequest;
 import space.space_spring.entity.PayRequest;
 import space.space_spring.entity.PayRequestTarget;
 import space.space_spring.entity.Space;
@@ -20,13 +20,10 @@
 import space.space_spring.util.user.UserUtils;
 
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.when;
-import static org.junit.jupiter.api.Assertions.*;
 
 @ExtendWith(MockitoExtension.class)
 class PayServiceTest {