diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html
index b8ca98d6..1b7c2279 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html
@@ -95,11 +95,12 @@
     <perfect-scrollbar
       fxFlex="1 1 auto"
       #psChatContent
-      (psScrollUp)="scrollUpinit = true"
-      (psYReachStart)="onScrollup($event)"
+      (psScrollUp)="onScrollup($event)"
+      (psYReachStart)="onScrollReachStart($event)"
+      (psYReachEnd)="onScrollReachEnd($event)"
     >
       <ucap-chat-messages
-        [messages]="eventList$ | async"
+        [messages]="eventList"
         [eventInfoStatus]="eventInfoStatus$ | async"
         [eventRemain]="eventRemain$ | async"
         [userInfos]="userInfoList"
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.scss b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.scss
index 1a229e49..9dd7bedf 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.scss
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.scss
@@ -104,3 +104,11 @@
     }
   }
 }
+
+::ng-deep .chat-snackbar-class {
+  .mat-simple-snackbar {
+    span {
+      @include ellipsis(1);
+    }
+  }
+}
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 afc482ea..c01f45a3 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
@@ -52,7 +52,11 @@ import {
 } from '@ucap-webmessenger/ui-chat';
 import { KEY_VER_INFO } from '@app/types/ver-info.type';
 import { VersionInfo2Response } from '@ucap-webmessenger/api-public';
-import { MatMenuTrigger } from '@angular/material';
+import {
+  MatMenuTrigger,
+  MatSnackBarRef,
+  SimpleSnackBar
+} from '@angular/material';
 import {
   CommonApiService,
   FileUploadItem,
@@ -69,7 +73,7 @@ import {
   FileViewerDialogData,
   FileViewerDialogResult
 } from '@app/layouts/common/dialogs/file-viewer.dialog.component';
-import { CONST } from '@ucap-webmessenger/core';
+import { CONST, StringUtil } from '@ucap-webmessenger/core';
 import { PerfectScrollbarComponent } from 'ngx-perfect-scrollbar';
 import { StatusCode } from '@ucap-webmessenger/api';
 import {
@@ -105,7 +109,9 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
 
   loginRes: LoginResponse;
   loginResSubscription: Subscription;
-  eventList$: Observable<Info<EventJson>[]>;
+  eventList: Info<EventJson>[];
+  eventListNew: Info<EventJson>[];
+  eventListSubscription: Subscription;
   baseEventSeq = 0;
   roomInfo: RoomInfo;
   roomInfoSubscription: Subscription;
@@ -127,6 +133,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
   /** Timer 대화방의 대화 삭제를 위한 interval */
   interval: any;
 
+  snackBarPreviewEvent: MatSnackBarRef<SimpleSnackBar>;
+
   constructor(
     private store: Store<any>,
     private sessionStorageService: SessionStorageService,
@@ -145,6 +153,12 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
     );
   }
 
+  setEventMoreInit() {
+    // 방정보가 바뀌면 이전대화 보기 관련 값들을 초기화 한다.
+    this.scrollUpinit = false;
+    this.eventMorePosition = 0;
+  }
+
   ngOnInit() {
     this.loginResSubscription = this.store
       .pipe(
@@ -161,9 +175,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
         tap(roomInfo => {
           this.roomInfo = roomInfo;
 
-          // 방정보가 바뀌면 이전대화 보기 관련 값들을 초기화 한다.
-          this.scrollUpinit = false;
-          this.eventMorePosition = 0;
+          this.setEventMoreInit();
         })
       )
       .subscribe();
@@ -188,15 +200,27 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
       })
     );
 
-    this.eventList$ = this.store.pipe(
-      select(AppStore.MessengerSelector.EventSelector.selectAllInfoList),
-      tap(infoList => {
-        if (!!infoList && infoList.length > 0) {
-          this.baseEventSeq = infoList[0].seq;
-          this.readyToReply();
-        }
-      })
-    );
+    this.eventListSubscription = this.store
+      .pipe(
+        select(AppStore.MessengerSelector.EventSelector.selectAllInfoList),
+        tap(infoList => {
+          if (!!this.eventList && this.eventList.length > 0) {
+            this.eventListNew = infoList.filter(info => {
+              if (info.seq <= this.eventList[this.eventList.length - 1].seq) {
+                return false;
+              }
+              return true;
+            });
+          }
+          this.eventList = infoList;
+
+          if (!!infoList && infoList.length > 0) {
+            this.baseEventSeq = infoList[0].seq;
+            this.readyToReply();
+          }
+        })
+      )
+      .subscribe();
 
     this.eventInfoStatus$ = this.store.pipe(
       select(AppStore.MessengerSelector.EventSelector.infoStatus)
@@ -219,6 +243,9 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
     if (!!this.userInfoListSubscription) {
       this.userInfoListSubscription.unsubscribe();
     }
+    if (!!this.eventListSubscription) {
+      this.eventListSubscription.unsubscribe();
+    }
 
     clearInterval(this.interval);
   }
@@ -259,6 +286,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
     }
   }
 
+  /** 대화전송 가능한 방인지 판단 */
   getEnableSend() {
     if (!this.roomInfo) {
       return false;
@@ -287,8 +315,6 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
     }
   }
 
-  selectContact() {}
-
   readyToReply(): void {
     setTimeout(() => {
       this.focusReplyInput();
@@ -304,6 +330,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
     });
   }
 
+  /** Scroll Handler */
   scrollToBottom(speed?: number): void {
     if (this.eventMorePosition > 0) {
       if (this.psChatContent.directiveRef) {
@@ -316,7 +343,34 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
             speed
           );
 
-          this.scrollUpinit = false;
+          this.eventMorePosition = 0;
+        });
+      }
+    } else if (this.scrollUpinit) {
+      if (!!this.eventListNew && this.eventListNew.length > 0) {
+        let message = '';
+        const info = this.eventListNew[this.eventListNew.length - 1];
+        const senderUser = this.userInfoList.filter(
+          user => user.seq === info.senderSeq
+        );
+        if (!!senderUser && senderUser.length > 0) {
+          message += `${senderUser[0].name} : `;
+        }
+        message += StringUtil.convertFinalEventMessage(
+          info.type,
+          info.sentMessageJson || info.sentMessage
+        );
+
+        this.snackBarPreviewEvent = this.snackBarService.open(message, 'GO', {
+          // duration: 3000,
+          verticalPosition: 'bottom',
+          horizontalPosition: 'center',
+          panelClass: ['chat-snackbar-class']
+        });
+        this.snackBarPreviewEvent.onAction().subscribe(() => {
+          this.setEventMoreInit();
+          this.scrollToBottom();
+          this.snackBarPreviewEvent.dismiss();
         });
       }
     } else {
@@ -330,8 +384,37 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
       }
     }
   }
+  onScrollup(event: any) {
+    this.scrollUpinit = true;
+  }
+  onScrollReachStart(event: any) {
+    this.onMoreEvent(this.baseEventSeq);
+  }
+  onScrollReachEnd(event: any) {
+    this.setEventMoreInit();
+    if (!!this.snackBarPreviewEvent) {
+      this.snackBarPreviewEvent.dismiss();
+    }
+  }
+
+  /** More Event */
+  onMoreEvent(seq: number) {
+    if (this.scrollUpinit && this.eventRemain) {
+      this.eventMorePosition = this.psChatContent.directiveRef.elementRef.nativeElement.scrollHeight;
+
+      this.store.dispatch(
+        EventStore.info({
+          roomSeq: this.roomInfo.roomSeq,
+          baseSeq: seq,
+          requestCount: CONST.EVENT_INFO_READ_COUNT
+        })
+      );
+    }
+  }
 
   async onSendMessage(message: string) {
+    this.setEventMoreInit();
+
     if (!message || message.trim().length === 0) {
       const result = await this.dialogService.open<
         AlertDialogComponent,
@@ -378,24 +461,6 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
     this.store.dispatch(RoomStore.updateOnlyAlarm({ roomInfo: this.roomInfo }));
   }
 
-  onScrollup(event: any) {
-    this.onMoreEvent(this.baseEventSeq);
-  }
-  /** More Event */
-  onMoreEvent(seq: number) {
-    if (this.scrollUpinit && this.eventRemain) {
-      this.store.dispatch(
-        EventStore.info({
-          roomSeq: this.roomInfo.roomSeq,
-          baseSeq: seq,
-          requestCount: CONST.EVENT_INFO_READ_COUNT
-        })
-      );
-      this.scrollUpinit = false;
-      this.eventMorePosition = this.psChatContent.directiveRef.elementRef.nativeElement.scrollHeight;
-    }
-  }
-
   /** MassText Detail View */
   onMassDetail(value: number) {
     this.store.dispatch(
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
index 98fdde8b..5b74fe46 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
@@ -104,7 +104,7 @@ export const reducer = createReducer(
       | string
       | null = StringUtil.convertFinalEventMessage(
       action.info.type,
-      action.info.sentMessage
+      action.info.sentMessageJson || action.info.sentMessage
     );
 
     if (!finalEventMessage) {
diff --git a/projects/ucap-webmessenger-ui/src/lib/services/snack-bar.service.ts b/projects/ucap-webmessenger-ui/src/lib/services/snack-bar.service.ts
index 34f1181b..651ee820 100644
--- a/projects/ucap-webmessenger-ui/src/lib/services/snack-bar.service.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/services/snack-bar.service.ts
@@ -1,6 +1,11 @@
 import { Injectable } from '@angular/core';
 
-import { MatSnackBar, MatSnackBarConfig } from '@angular/material';
+import {
+  MatSnackBar,
+  MatSnackBarConfig,
+  MatSnackBarRef,
+  SimpleSnackBar
+} from '@angular/material';
 
 @Injectable({
   providedIn: 'root'
@@ -12,7 +17,7 @@ export class SnackBarService {
     message: string,
     action?: string,
     config?: MatSnackBarConfig
-  ): void {
-    this.matSnackBar.open(message, action, config);
+  ): MatSnackBarRef<SimpleSnackBar> {
+    return this.matSnackBar.open(message, action, config);
   }
 }