diff --git a/src/main/java/com/hanaro/hanafun/revenue/domain/RevenueRepository.java b/src/main/java/com/hanaro/hanafun/revenue/domain/RevenueRepository.java
index 42b5f04..31902bc 100644
--- a/src/main/java/com/hanaro/hanafun/revenue/domain/RevenueRepository.java
+++ b/src/main/java/com/hanaro/hanafun/revenue/domain/RevenueRepository.java
@@ -11,10 +11,8 @@
 
 public interface RevenueRepository extends JpaRepository<RevenueEntity, Long> {
     Optional<RevenueEntity> findByCreatedDateBetween(LocalDateTime startDateTime, LocalDateTime endDateTime);
-
     @Query(value = "SELECT SUM(R.revenue) FROM RevenueEntity R WHERE R.lessonEntity = :lessonEntity")
     Long totalRevenueByLessonId(@Param("lessonEntity") LessonEntity lessonEntity);
-
     Optional<RevenueEntity> findByLessonEntityAndCreatedDateBetween(LessonEntity lessonEntity, LocalDateTime startDateTime, LocalDateTime endDateTime);
     Optional<List<RevenueEntity>> findByLessonEntityLessonIdAndCreatedDateBetween(Long lessonId, LocalDateTime startDateTime, LocalDateTime endDateTime);
 }
diff --git a/src/main/java/com/hanaro/hanafun/revenue/service/impl/RevenueServiceImpl.java b/src/main/java/com/hanaro/hanafun/revenue/service/impl/RevenueServiceImpl.java
index d55be5e..1a6a9c4 100644
--- a/src/main/java/com/hanaro/hanafun/revenue/service/impl/RevenueServiceImpl.java
+++ b/src/main/java/com/hanaro/hanafun/revenue/service/impl/RevenueServiceImpl.java
@@ -5,9 +5,11 @@
 import com.hanaro.hanafun.host.exception.HostNotFoundException;
 import com.hanaro.hanafun.lesson.domain.LessonEntity;
 import com.hanaro.hanafun.lesson.domain.LessonRepository;
+import com.hanaro.hanafun.lesson.exception.LessonNotFoundException;
 import com.hanaro.hanafun.revenue.domain.RevenueEntity;
 import com.hanaro.hanafun.revenue.domain.RevenueRepository;
 import com.hanaro.hanafun.revenue.dto.*;
+import com.hanaro.hanafun.revenue.exception.RevenueNotFoundException;
 import com.hanaro.hanafun.revenue.mapper.RevenueMapper;
 import com.hanaro.hanafun.revenue.service.RevenueService;
 import lombok.RequiredArgsConstructor;
@@ -45,13 +47,19 @@ public TotalRevenueResDto totalRevenue(Long userId) {
     @Override
     @Transactional
     public List<MonthRevenueResDto> monthRevenue(Long userId, Integer year, Integer month) {
-        HostEntity hostEntity = hostRepository.findByUserEntityUserId(userId).orElseThrow(() -> new HostNotFoundException());
-        List<LessonEntity> lessonEntityList = lessonRepository.findByHostEntityHostId(hostEntity.getHostId()).orElseThrow();
+        //호스트 가져오기
+        HostEntity hostEntity = hostRepository.findByUserEntityUserId(userId)
+                .orElseThrow(() -> new HostNotFoundException());
+
+        //호스트의 전체 강좌 목록 가져오기
+        List<LessonEntity> lessonEntityList = lessonRepository.findByHostEntityHostId(hostEntity.getHostId())
+                .orElseThrow(() -> new LessonNotFoundException());
 
         YearMonth yearMonth = YearMonth.of(year, month);
         LocalDateTime startOfMonth = yearMonth.atDay(1).atStartOfDay();
         LocalDateTime endOfMonth = yearMonth.atEndOfMonth().atTime(23, 59, 59);
 
+        //강좌마다 해당년월의 매출 하나씩 건지고, collect 합쳐서 해당년월의 전체 매출 리스트 구하기
         List<RevenueEntity> revenueEntityList = lessonEntityList.stream()
                 .flatMap(lessonEntity -> revenueRepository.findByLessonEntityAndCreatedDateBetween(lessonEntity, startOfMonth, endOfMonth).stream())
                 .collect(Collectors.toList());
@@ -68,7 +76,10 @@ public List<LessonRevenueResDto> lessonRevenue(Integer year, Long lessonId) {
         LocalDateTime startOfYear = searchYear.atMonth(1).atDay(1).atStartOfDay();
         LocalDateTime endOfYear = searchYear.atMonth(12).atEndOfMonth().atTime(23,59,59);
 
-        List<RevenueEntity> revenueEntityList = revenueRepository.findByLessonEntityLessonIdAndCreatedDateBetween(lessonId, startOfYear, endOfYear).orElseThrow();
+        //강좌의 해당 년 매출 리스트 구하기
+        List<RevenueEntity> revenueEntityList = revenueRepository
+                .findByLessonEntityLessonIdAndCreatedDateBetween(lessonId, startOfYear, endOfYear)
+                .orElseThrow(() -> new RevenueNotFoundException());
 
         return revenueEntityList.stream()
                 .map(RevenueMapper::revenueEntityToLessonRevenueResDto)
@@ -78,13 +89,16 @@ public List<LessonRevenueResDto> lessonRevenue(Integer year, Long lessonId) {
     @Override
     @Transactional
     public UpdatePriceResDto updatePrice(UpdatePriceReqDto updatePriceReqDto) {
-        LessonEntity lessonEntity = lessonRepository.findById(updatePriceReqDto.getLessonId()).orElseThrow();
+        LessonEntity lessonEntity = lessonRepository.findById(updatePriceReqDto.getLessonId())
+                .orElseThrow(() -> new LessonNotFoundException());
 
         YearMonth yearMonth = YearMonth.of(updatePriceReqDto.getYear(), updatePriceReqDto.getMonth());
         LocalDateTime startOfMonth = yearMonth.atDay(1).atStartOfDay();
         LocalDateTime endOfMonth = yearMonth.atEndOfMonth().atTime(23, 59, 59);
 
-        RevenueEntity revenueEntity = revenueRepository.findByLessonEntityAndCreatedDateBetween(lessonEntity, startOfMonth, endOfMonth).orElseThrow();
+        RevenueEntity revenueEntity = revenueRepository
+                .findByLessonEntityAndCreatedDateBetween(lessonEntity, startOfMonth, endOfMonth)
+                .orElseThrow(() -> new RevenueNotFoundException());
         revenueEntity.setMaterialPrice(updatePriceReqDto.getMaterialPrice());
         revenueEntity.setRentalPrice(updatePriceReqDto.getRentalPrice());
         revenueEntity.setEtcPrice(updatePriceReqDto.getEtcPrice());