diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts
index 0dd8874f..87c54e4c 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts
@@ -20,7 +20,8 @@ import { Subscription, combineLatest, Observable } from 'rxjs';
 import {
   RoomInfo,
   UserInfoShort,
-  UserInfo as RoomUserInfo
+  UserInfo as RoomUserInfo,
+  RoomType
 } from '@ucap-webmessenger/protocol-room';
 import * as AppStore from '@app/store';
 import * as ChatStore from '@app/store/messenger/chat';
@@ -288,9 +289,14 @@ export class ChatComponent implements OnInit, OnDestroy, AfterViewChecked {
         value => roomInfo.roomSeq === value.roomSeq
       );
       if (-1 < i) {
-        return this.roomUserShortList[i].userInfos.filter(
-          user => user.isJoinRoom
-        );
+        if (roomInfo.roomType === RoomType.Single) {
+          // Ignore type of joinRoom for Single Room.
+          return this.roomUserShortList[i].userInfos;
+        } else {
+          return this.roomUserShortList[i].userInfos.filter(
+            user => user.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 647c15aa..d0317acf 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
@@ -6,7 +6,7 @@ import {
   EventEmitter,
   ViewChild
 } from '@angular/core';
-import { Subscription } from 'rxjs';
+import { Subscription, combineLatest } from 'rxjs';
 import { Store, select } from '@ngrx/store';
 import { tap, map, take } from 'rxjs/operators';
 
@@ -86,16 +86,22 @@ export class RoomUserListComponent implements OnInit, OnDestroy {
   }
 
   ngOnInit() {
-    this.userInfoListSubscription = this.store
-      .pipe(
-        select(AppStore.MessengerSelector.RoomSelector.selectUserinfolist),
-        tap(userInfoList => {
-          this.userInfoList = userInfoList
-            .filter(userInfo => userInfo.isJoinRoom === true)
-            .sort((a, b) => (a.name < b.name ? -1 : a.name > b.name ? 1 : 0));
+    this.userInfoListSubscription = combineLatest([
+      this.store.pipe(
+        select(AppStore.MessengerSelector.RoomSelector.selectUserinfolist)
+      ),
+      this.store.pipe(select(AppStore.MessengerSelector.RoomSelector.roomInfo))
+    ]).subscribe(([userInfoList, roomInfo]) => {
+      this.userInfoList = userInfoList
+        .filter(userInfo => {
+          if (roomInfo.roomType === RoomType.Single) {
+            return true;
+          } else {
+            return userInfo.isJoinRoom === true;
+          }
         })
-      )
-      .subscribe();
+        .sort((a, b) => (a.name < b.name ? -1 : a.name > b.name ? 1 : 0));
+    });
 
     this.roomInfoSubscription = this.store
       .pipe(