diff --git a/backend/src/main/java/meetona/department/DepartmentService.java b/backend/src/main/java/meetona/department/DepartmentService.java
index c360a7c..2099fff 100644
--- a/backend/src/main/java/meetona/department/DepartmentService.java
+++ b/backend/src/main/java/meetona/department/DepartmentService.java
@@ -84,7 +84,7 @@ public ApiResponse<DepartmentDto> add(DepartmentRequest request) {
     public ApiResponse<DepartmentDto> update(UUID id, DepartmentRequest request) {
         boolean isUnitExists = repository.existsById(id);
 
-        if(isUnitExists) {
+        if(!isUnitExists) {
             throw new AppException("Id does not exists");
         }
 
@@ -105,7 +105,7 @@ public ApiResponse<DepartmentDto> update(UUID id, DepartmentRequest request) {
     public ApiResponse<DepartmentDto> delete(UUID id) {
         boolean isDepartmentExists = repository.existsById(id);
 
-        if(isDepartmentExists){
+        if(!isDepartmentExists){
             throw new ResourceNotFoundException("User", "id", id);
         }
 
diff --git a/backend/src/main/java/meetona/meeting/MeetingService.java b/backend/src/main/java/meetona/meeting/MeetingService.java
index f5eadbd..623f6a0 100644
--- a/backend/src/main/java/meetona/meeting/MeetingService.java
+++ b/backend/src/main/java/meetona/meeting/MeetingService.java
@@ -75,7 +75,7 @@ public ApiResponse<MeetingDto> add(MeetingRequest request) {
     public ApiResponse<MeetingDto> update(UUID id, MeetingRequest request) {
         boolean isMeetingExists = meetingRepository.existsById(id);
 
-        if(isMeetingExists) {
+        if(!isMeetingExists) {
             throw new AppException("Id does not exists");
         }
 
@@ -96,7 +96,7 @@ public ApiResponse<MeetingDto> update(UUID id, MeetingRequest request) {
     public ApiResponse<MeetingDto> delete(UUID id) {
         boolean isUnitExists = meetingRepository.existsById(id);
 
-        if(isUnitExists){
+        if(!isUnitExists){
             throw new ResourceNotFoundException("User", "id", id);
         }
 
diff --git a/backend/src/main/java/meetona/member/MemberService.java b/backend/src/main/java/meetona/member/MemberService.java
index 421e0db..bba94ec 100644
--- a/backend/src/main/java/meetona/member/MemberService.java
+++ b/backend/src/main/java/meetona/member/MemberService.java
@@ -107,7 +107,7 @@ public ApiResponse<MemberDto> add(MemberRequest request) {
     public ApiResponse<MemberDto> update(UUID id, MemberRequest request) {
         boolean isUnitExists = memberRepository.existsById(id);
 
-        if(isUnitExists) {
+        if(!isUnitExists) {
             throw new AppException("Id does not exists");
         }
 
@@ -128,7 +128,7 @@ public ApiResponse<MemberDto> update(UUID id, MemberRequest request) {
     public ApiResponse<MemberDto> delete(UUID id) {
         boolean isUnitExists = memberRepository.existsById(id);
 
-        if(isUnitExists){
+        if(!isUnitExists){
             throw new ResourceNotFoundException("User", "id", id);
         }
 
diff --git a/backend/src/main/java/meetona/unit/UnitService.java b/backend/src/main/java/meetona/unit/UnitService.java
index a2d14de..54aff06 100644
--- a/backend/src/main/java/meetona/unit/UnitService.java
+++ b/backend/src/main/java/meetona/unit/UnitService.java
@@ -82,7 +82,7 @@ public ApiResponse<UnitDto> add(UnitRequest request) {
     public ApiResponse<UnitDto> update(UUID id, UnitRequest request) {
         boolean isUnitExists = unitRepository.existsById(id);
 
-        if(isUnitExists) {
+        if(!isUnitExists) {
             throw new ResourceNotFoundException("User", "id", id);
         }
 
@@ -103,7 +103,7 @@ public ApiResponse<UnitDto> update(UUID id, UnitRequest request) {
     public ApiResponse<UnitDto> delete(UUID id) {
         boolean isUnitExists = unitRepository.existsById(id);
 
-        if(isUnitExists){
+        if(!isUnitExists){
             throw new ResourceNotFoundException("User", "id", id);
         }
 
diff --git a/backend/src/main/java/meetona/user/UserService.java b/backend/src/main/java/meetona/user/UserService.java
index f2a5fc2..4157a0a 100644
--- a/backend/src/main/java/meetona/user/UserService.java
+++ b/backend/src/main/java/meetona/user/UserService.java
@@ -125,7 +125,7 @@ public ApiResponse<UserDto> add(UserRequest userRequest) {
     public ApiResponse<UserDto> update(UUID id, UserRequest request) {
         boolean isUserExists = userRepository.existsById(id);
 
-        if(isUserExists) {
+        if(!isUserExists) {
             throw new ResourceNotFoundException("User", "id", id);
         }
 
@@ -146,7 +146,7 @@ public ApiResponse<UserDto> update(UUID id, UserRequest request) {
     public ApiResponse<UserDto> delete(UUID id) {
         boolean isUserExists = userRepository.existsById(id);
 
-        if(isUserExists){
+        if(!isUserExists){
             throw new ResourceNotFoundException("User", "id", id);
         }