diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
index b3cca3fc..acd4ffc8 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
@@ -1508,6 +1508,11 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
         break;
       case 'ADD_MEMBER':
         {
+          const curRoomUser = this.userInfoListSubject.value.filter(
+            user =>
+              user.seq !== this.loginResSubject.value.userSeq && user.isJoinRoom
+          );
+
           const result = await this.dialogService.open<
             CreateChatDialogComponent,
             CreateChatDialogData,
@@ -1517,15 +1522,27 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
             data: {
               type: UserSelectDialogType.EditChatMember,
               title: this.translateService.instant('chat.modifyRoomMember'),
-              curRoomUser: this.userInfoListSubject.value.filter(
-                user =>
-                  user.seq !== this.loginResSubject.value.userSeq &&
-                  user.isJoinRoom
-              )
+              curRoomUser
             }
           });
 
           if (!!result && !!result.choice && result.choice) {
+            if (
+              !!result.selectedUserList &&
+              result.selectedUserList.length > 0 &&
+              curRoomUser
+                .map(user => user.seq)
+                .sort()
+                .join('|') ===
+                result.selectedUserList
+                  .map(user => user.seq)
+                  .sort()
+                  .join('|')
+            ) {
+              // 변경된 것이 없다면 중지.
+              return;
+            }
+
             // include me here..
             const userSeqs: number[] = this.userInfoListSubject.value
               .filter(userInfo => userInfo.isJoinRoom)
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/right-drawer/room-user-list.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/right-drawer/room-user-list.component.ts
index 52acab5e..bf2db933 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/right-drawer/room-user-list.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/right-drawer/room-user-list.component.ts
@@ -138,6 +138,10 @@ export class RoomUserListComponent implements OnInit, OnDestroy {
   }
 
   async onClickAddMember() {
+    const curRoomUser = this.userInfoList.filter(
+      user => user.seq !== this.loginRes.userSeq && user.isJoinRoom
+    );
+
     const result = await this.dialogService.open<
       CreateChatDialogComponent,
       CreateChatDialogData,
@@ -147,18 +151,31 @@ export class RoomUserListComponent implements OnInit, OnDestroy {
       data: {
         type: UserSelectDialogType.EditChatMember,
         title: this.translateService.instant('chat.modifyRoomMember'),
-        curRoomUser: this.userInfoList.filter(
-          user => user.seq !== this.loginRes.userSeq && user.isJoinRoom
-        )
+        curRoomUser
       }
     });
 
     if (!!result && !!result.choice && result.choice) {
+      if (
+        !!result.selectedUserList &&
+        result.selectedUserList.length > 0 &&
+        curRoomUser
+          .map(user => user.seq)
+          .sort()
+          .join('|') ===
+          result.selectedUserList
+            .map(user => user.seq)
+            .sort()
+            .join('|')
+      ) {
+        // 변경된 것이 없다면 중지.
+        return;
+      }
+
       // include me here..
       const userSeqs: number[] = this.userInfoList
         .filter(userInfo => userInfo.isJoinRoom)
         .map(userInfo => userInfo.seq);
-
       if (!!result.selectedUserList && result.selectedUserList.length > 0) {
         result.selectedUserList.forEach(user => {
           if (userSeqs.indexOf(user.seq) < 0) {