diff --git a/src/main/java/com/seoultech/synergybe/domain/apply/dto/response/GetApplyResponse.java b/src/main/java/com/seoultech/synergybe/domain/apply/dto/response/GetApplyResponse.java
index 19460827..51564945 100644
--- a/src/main/java/com/seoultech/synergybe/domain/apply/dto/response/GetApplyResponse.java
+++ b/src/main/java/com/seoultech/synergybe/domain/apply/dto/response/GetApplyResponse.java
@@ -2,11 +2,16 @@
 
 import com.querydsl.core.annotations.QueryProjection;
 import com.seoultech.synergybe.domain.apply.ApplyStatus;
-import lombok.Builder;
 
-@Builder
 public record GetApplyResponse(
         String applyId,
-        ApplyStatus status
+        String status
 ) {
+    @QueryProjection
+    public GetApplyResponse(String applyId, ApplyStatus status) {
+        this(
+                applyId,
+                status.getName()
+        );
+    }
 }
diff --git a/src/main/java/com/seoultech/synergybe/domain/apply/service/ApplyService.java b/src/main/java/com/seoultech/synergybe/domain/apply/service/ApplyService.java
index 6df65153..f1c6aee0 100644
--- a/src/main/java/com/seoultech/synergybe/domain/apply/service/ApplyService.java
+++ b/src/main/java/com/seoultech/synergybe/domain/apply/service/ApplyService.java
@@ -20,11 +20,10 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
-import java.util.Optional;
 
 @Slf4j
 @Service
-@Transactional
+@Transactional(readOnly = true)
 @RequiredArgsConstructor
 public class ApplyService {
     private final ApplyRepository applyRepository;
@@ -34,8 +33,10 @@ public class ApplyService {
     private final NotificationService notificationService;
     private final IdGenerator idGenerator;
 
-    public GetApplyResponse createApply(User user, String projectId) {
+    @Transactional
+    public String createApply(String userId, String projectId) {
         Project project = projectService.findProjectById(projectId);
+        User user = userService.getUser(userId);
         String applyId = idGenerator.generateId(IdPrefix.APPLY);
 
         Apply apply = Apply.builder()
@@ -47,26 +48,20 @@ public GetApplyResponse createApply(User user, String projectId) {
 //        User leader = userService.getUser(projectService.getProject(projectId).leaderId());
 //        notificationService.send(leader, NotificationType.PROJECT_APPLY, "프로젝트 신청이 완료되었습니다.", projectId);
 
-        GetApplyResponse getApplyResponse = GetApplyResponse.builder().build();
-
-        return getApplyResponse;
+        return savedApply.getId();
     }
 
-    public void deleteApply(String userId, String projectId) {
-        Optional<Apply> applyOptional = applyRepository.findApplyByUserIdAndProjectId(userId, projectId);
-
-        if (applyOptional.isPresent()) {
-            applyRepository.delete(applyOptional.get());
-
-        } else {
-            throw new ApplyNotFoundException("존재하지 않는 신청내역입니다.");
-        }
+    @Transactional
+    public void deleteApply(String applyId) {
+        // todo
+        // 사용자 권한 검증
+        Apply apply = getApply(applyId);
+        applyRepository.delete(apply);
     }
 
-    public void acceptApply(String userId, String projectId) {
-        Apply apply = applyRepository.findApplyByUserIdAndProjectId(userId, projectId)
-                .orElseThrow(() -> new ApplyNotFoundException("존재하지 않는 신청내역입니다."));
-
+    @Transactional
+    public void updateApplyStatusToAccept(String userId, String projectId) {
+        Apply apply = applyRepository.findApplyByUserIdAndProjectId(userId, projectId);
         apply.changeStatusToAccept();
         Project project = projectService.findProjectById(projectId);
         User user = userService.getUser(userId);
@@ -79,16 +74,13 @@ public void acceptApply(String userId, String projectId) {
         projectUserRepository.save(projectUser);
         User applyUser = userService.getUser(userId);
 
-        // apply 삭제
-//        applyRepository.delete(apply);
-
         // 알림 발송
 //        notificationService.send(applyUser, NotificationType.PROJECT_ACCEPT, "신청이 수락되었습니다.", projectId);
     }
 
-    public void rejectApply(String userId, String projectId) {
-        Apply apply = applyRepository.findApplyByUserIdAndProjectId(userId, projectId)
-                .orElseThrow(() -> new ApplyNotFoundException("존재하지 않는 신청내역입니다."));
+    @Transactional
+    public void updateApplyStatusToReject(String userId, String projectId) {
+        Apply apply = applyRepository.findApplyByUserIdAndProjectId(userId, projectId);
         apply.changeStatusToReject();
 
         // apply 삭제
@@ -101,13 +93,11 @@ public void rejectApply(String userId, String projectId) {
 //        return RejectApplyResponse.from(apply);
     }
 
-    public GetListApplyResponse getMyApplyList(User user) {
+    public GetListApplyResponse getMyApplyList(String userId) {
+        User user = userService.getUser(userId);
         List<Apply> applies = applyRepository.findAllProcessByUserId(user.getUserId());
 
-        GetListApplyResponse getListApplyResponse = GetListApplyResponse.builder().build();
-
-        return getListApplyResponse;
-
+        return ApplyMapperEntityToDto.applyListToResponse(applies);
     }
 
     public GetListApplyUserResponse getApplyUserList(String projectId) {
@@ -116,8 +106,10 @@ public GetListApplyUserResponse getApplyUserList(String projectId) {
         // user_id 는 PK가 아닌 UNIQUE KEY 이므로 findAllById() 사용 못함
         List<User> users = userService.getUsers(userIds);
 
-        GetListApplyUserResponse getListApplyUserResponse = GetListApplyUserResponse.builder().build();
+        return ApplyMapperEntityToDto.userListToResponse(users);
+    }
 
-        return getListApplyUserResponse;
+    public Apply getApply(String applyId) {
+        return applyRepository.findById(applyId).orElseThrow(() -> new ApplyNotFoundException("신청내역이 존재하지 않습니다."));
     }
 }