diff --git a/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/repository/LibrarySeatRepository.java b/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/repository/LibrarySeatRepository.java
index faf44bf..97a8dd5 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/repository/LibrarySeatRepository.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/repository/LibrarySeatRepository.java
@@ -1,15 +1,17 @@
 package com.example.pnuunivmiryangcampus.librarySeat.repository;
 
 import com.example.pnuunivmiryangcampus.librarySeat.LibrarySeat;
-import java.util.List;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 
+import java.util.List;
+import java.util.Optional;
+
 public interface LibrarySeatRepository extends JpaRepository<LibrarySeat, Long> {
 
-    // Optional Type 고려
-    @Query("select ls from LibrarySeat ls where ls.availability = '사용가능'")
-    List<LibrarySeat> findLibrarySeatsByAvailability();
+    @Query("select ls from LibrarySeat ls where ls.isDeleted = false and ls.availability = '사용가능'")
+    Optional<List<LibrarySeat>> findLibrarySeatsByAvailability();
 
-    LibrarySeat findBySeatNumber(int seatNumber);
+    @Query("select ls from LibrarySeat ls where ls.isDeleted = false and ls.id = :id")
+    Optional<LibrarySeat> findById(Long id);
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/service/LibrarySeatService.java b/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/service/LibrarySeatService.java
index a6f4920..0088171 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/service/LibrarySeatService.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/librarySeat/service/LibrarySeatService.java
@@ -17,6 +17,7 @@ public class LibrarySeatService {
     @Transactional(readOnly = true)
     public List<LibrarySeatDto> getAvailableLibrarySeat() {
         return librarySeatRepository.findLibrarySeatsByAvailability()
+                .orElseThrow()
                 .stream()
                 .map(LibrarySeatDto::from)
                 .toList();
diff --git a/src/main/java/com/example/pnuunivmiryangcampus/reservation/Reservation.java b/src/main/java/com/example/pnuunivmiryangcampus/reservation/Reservation.java
index d4947aa..7a5bc80 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/reservation/Reservation.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/reservation/Reservation.java
@@ -6,9 +6,12 @@
 import java.time.LocalDateTime;
 import lombok.Getter;
 import lombok.ToString;
+import org.hibernate.annotations.SQLDelete;
+
 
 @Getter
 @ToString(callSuper = true)
+@SQLDelete(sql = "update reservation set is_deleted = true, modified_at = current_time, modified_by = user_account_id where id  = ?")
 @Entity
 public class Reservation extends AuditingFields {
 
diff --git a/src/main/java/com/example/pnuunivmiryangcampus/reservation/controller/ReservationController.java b/src/main/java/com/example/pnuunivmiryangcampus/reservation/controller/ReservationController.java
index ae92fb7..c7aedf8 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/reservation/controller/ReservationController.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/reservation/controller/ReservationController.java
@@ -32,7 +32,7 @@ public ResponseEntity<Void> reservation(@PathVariable Long seatId, @Authenticati
         ReservationDto reservationDto = ReservationDto.of(findUser.getId(), seatId, startAt, endAt);
         reservationService.saveReservation(reservationDto);
 
-        return ResponseEntity.created(URI.create("/library/reservation/" + findUser.getId())).build();
+        return ResponseEntity.created(URI.create("/library/reservation/")).build();
     }
 
     @GetMapping
@@ -51,4 +51,11 @@ public ResponseEntity<ReservationResponse> getReservation(@AuthenticationPrincip
     public ResponseEntity<ReservationRenewalResponse> reservationRenewal(@PathVariable Long reservationId) {
         return ResponseEntity.ok(reservationService.updateReservationRenewalCount(reservationId));
     }
+
+    @DeleteMapping("/{reservationId}")
+    public ResponseEntity<Void> reservation(@PathVariable Long reservationId) {
+        reservationService.deleteReservation(reservationId);
+
+        return ResponseEntity.noContent().build();
+    }
 }
diff --git a/src/main/java/com/example/pnuunivmiryangcampus/reservation/dto/response/ReservationResponse.java b/src/main/java/com/example/pnuunivmiryangcampus/reservation/dto/response/ReservationResponse.java
index ea91a36..9113d37 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/reservation/dto/response/ReservationResponse.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/reservation/dto/response/ReservationResponse.java
@@ -7,20 +7,20 @@
 
 public record ReservationResponse(
         Long ReservationId,
-        Long seatNumber,
+        Long seatId,
         LocalDateTime startAt,
         LocalDateTime endAt,
         int renewalCount
 ) implements Serializable {
 
-    public static ReservationResponse of(Long ReservationId, Long seatNumber, LocalDateTime startAt, LocalDateTime endAt, int renewalCount) {
-        return new ReservationResponse(ReservationId, seatNumber, startAt, endAt, renewalCount);
+    public static ReservationResponse of(Long ReservationId, Long seatId, LocalDateTime startAt, LocalDateTime endAt, int renewalCount) {
+        return new ReservationResponse(ReservationId, seatId, startAt, endAt, renewalCount);
     }
 
-    public static ReservationResponse from(Reservation entity, Long seatNumber) {
+    public static ReservationResponse from(Reservation entity, Long seatId) {
         return new ReservationResponse(
                 entity.getId(),
-                seatNumber,
+                seatId,
                 entity.getStartAt(),
                 entity.getEndAt(),
                 entity.getRenewalCount()
diff --git a/src/main/java/com/example/pnuunivmiryangcampus/reservation/repository/ReservationRepository.java b/src/main/java/com/example/pnuunivmiryangcampus/reservation/repository/ReservationRepository.java
index 4f68f4e..59574c8 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/reservation/repository/ReservationRepository.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/reservation/repository/ReservationRepository.java
@@ -2,9 +2,15 @@
 
 import com.example.pnuunivmiryangcampus.reservation.Reservation;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 
 import java.util.Optional;
 
 public interface ReservationRepository extends JpaRepository<Reservation, Long> {
+
+    @Query("select r from Reservation r where r.isDeleted = false and r.userAccountId = :userId")
     Optional<Reservation> findByUserAccountId(Long userId);
+
+    @Query("select r from Reservation r where r.isDeleted = false and r.id = :id")
+    Optional<Reservation> findById(Long id);
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/pnuunivmiryangcampus/reservation/service/ReservationService.java b/src/main/java/com/example/pnuunivmiryangcampus/reservation/service/ReservationService.java
index 4f82f7a..37d9ef6 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/reservation/service/ReservationService.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/reservation/service/ReservationService.java
@@ -31,9 +31,9 @@ public ReservationResponse getReservationByUserId(Long userId) {
         Optional<Reservation> reservation = reservationRepository.findByUserAccountId(userId);
 
         if (reservation.isPresent()) {
-            Long reservedSeatNumber = librarySeatRepository.findById(reservation.get().getLibrarySeatId()).orElseThrow().getId();
+            Long reservedSeatId = librarySeatRepository.findById(reservation.get().getLibrarySeatId()).orElseThrow().getId();
 
-            return ReservationResponse.from(reservation.get(), reservedSeatNumber);
+            return ReservationResponse.from(reservation.get(), reservedSeatId);
         }
 
         return null;
@@ -54,4 +54,10 @@ private void checkRenewalCount(Reservation reservation) {
             throw new ReservationLimitExceededException();
         }
     }
+
+    @Transactional
+    public void deleteReservation(Long reservationId) {
+        reservationRepository.deleteById(reservationId);
+    }
 }
+
diff --git a/src/main/java/com/example/pnuunivmiryangcampus/userAccount/repository/UserAccountRepository.java b/src/main/java/com/example/pnuunivmiryangcampus/userAccount/repository/UserAccountRepository.java
index 231b863..d5ae994 100644
--- a/src/main/java/com/example/pnuunivmiryangcampus/userAccount/repository/UserAccountRepository.java
+++ b/src/main/java/com/example/pnuunivmiryangcampus/userAccount/repository/UserAccountRepository.java
@@ -3,8 +3,10 @@
 import com.example.pnuunivmiryangcampus.userAccount.UserAccount;
 import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 
 public interface UserAccountRepository extends JpaRepository<UserAccount, Long> {
 
+    @Query("select ua from UserAccount ua where ua.isDeleted = false and ua.sub = :sub")
     Optional<UserAccount> findBySub(String sub);
 }
\ No newline at end of file