diff --git a/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts b/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts
index 546f53bd..7c78ab41 100644
--- a/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts
+++ b/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts
@@ -7,7 +7,8 @@ import {
   ViewChild,
   OnDestroy,
   ChangeDetectionStrategy,
-  ElementRef
+  ElementRef,
+  ChangeDetectorRef
 } from '@angular/core';
 
 import {
@@ -146,6 +147,7 @@ export class MessagesComponent implements OnInit, OnDestroy {
   constructor(
     private logger: NGXLogger,
     private datePipe: DatePipe,
+    private changeDetectorRef: ChangeDetectorRef,
     private translateService: TranslateService
   ) {}
 
@@ -157,12 +159,12 @@ export class MessagesComponent implements OnInit, OnDestroy {
       this.loginRes = loginRes;
     });
     this.roomInfoSubscription = this.roomInfo$.subscribe(roomInfo => {
-      this.eventList = undefined;
-      this.newEventList = undefined;
-      this.searchedList = undefined;
-      this.eventInfoStatus = undefined;
-      this.eventRemained = undefined;
-      this.userInfos = undefined;
+      // this.eventList = undefined;
+      // this.newEventList = undefined;
+      // this.searchedList = undefined;
+      // this.eventInfoStatus = undefined;
+      // this.eventRemained = undefined;
+      // this.userInfos = undefined;
 
       this.initEventMore();
       this.roomInfo = roomInfo;
@@ -180,6 +182,7 @@ export class MessagesComponent implements OnInit, OnDestroy {
       }
 
       this.eventList = eventList;
+      this.changeDetectorRef.detectChanges();
 
       if (this.searchingMode) {
         const baseseq = this.baseEventSeq;
@@ -284,6 +287,9 @@ export class MessagesComponent implements OnInit, OnDestroy {
   }
 
   getUnreadCount(message: Info<EventJson>): string | number {
+    // if (!this.userInfos || 0 === this.userInfos.length) {
+    //   return '';
+    // }
     const unreadCnt = this.userInfos.filter(user => {
       if (message.senderSeq === user.seq) {
         // 본인 글은 unreadCount 에 포함하지 않는다.
@@ -392,9 +398,6 @@ export class MessagesComponent implements OnInit, OnDestroy {
 
     setTimeout(() => {
       this.scrollToBottom();
-      // setTimeout(() => {
-      //   this.chatMessagesContainer.nativeElement.classList.remove('hide');
-      // }, 100);
     });
   }
 
@@ -433,23 +436,15 @@ export class MessagesComponent implements OnInit, OnDestroy {
 
           this.firstCheckReadHere = false;
         } else {
-          this.virtualScroller.scrollInto(
-            this.eventList[this.eventList.length - 1],
+          this.virtualScroller.scrollToIndex(
+            this.eventList.length - 1,
             true,
             0,
             0,
             () => {
-              if (!this.scrollUpInitalized) {
-                this.chatMessagesContainer.nativeElement.classList.remove(
-                  'hide'
-                );
-              }
+              this.chatMessagesContainer.nativeElement.classList.remove('hide');
             }
           );
-
-          // setTimeout(() => {
-          //   this.psChatContent.scrollToBottom(0, speed);
-          // });
         }
       }
     }