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 7a068900..8e3afbe1 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
@@ -19,7 +19,8 @@
         {{ getRoomName() }}
       </div>
       <div *ngIf="!!roomInfo && roomInfo.isTimeRoom">
-        <mat-icon>timer</mat-icon> {{ getConvertTimer(roomInfo.timeRoomInterval) }}
+        <mat-icon>timer</mat-icon>
+        {{ getConvertTimer(roomInfo.timeRoomInterval) }}
       </div>
       <div class="room-option">
         <button
@@ -73,13 +74,19 @@
     <!-- Timer Room Info -->
 
     <!-- CHAT MESSAGES -->
-    <perfect-scrollbar fxFlex="1 1 auto" #psChatContent>
+    <perfect-scrollbar
+      fxFlex="1 1 auto"
+      #psChatContent
+      (psYReachStart)="onScrollup($event)"
+    >
       <ucap-chat-messages
         [messages]="eventList$ | async"
         [eventInfoStatus]="eventInfoStatus$ | async"
+        [eventRemain]="eventRemain$ | async"
         [userInfos]="userInfoList"
         [loginRes]="loginRes"
         [sessionVerInfo]="sessionVerInfo"
+        (moreEvent)="onMoreEvent($event)"
         (massDetail)="onMassDetail($event)"
         (save)="onSave($event)"
         (imageViewer)="onImageViewer($event)"
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 32b74255..008e7330 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
@@ -58,7 +58,7 @@ import {
   ImageViewerDialogData,
   ImageViewerDialogResult
 } from '@app/layouts/common/dialogs/image-viewer.dialog.component';
-import { Maximum_Range } from '@ucap-webmessenger/core';
+import { CONST } from '@ucap-webmessenger/core';
 import { PerfectScrollbarComponent } from 'ngx-perfect-scrollbar';
 
 @Component({
@@ -83,12 +83,15 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewChecked {
   loginRes: LoginResponse;
   loginResSubscription: Subscription;
   eventList$: Observable<Info[]>;
+  baseEventSeq = 0;
   roomInfo: RoomInfo;
   roomInfoSubscription: Subscription;
   userInfoList: UserInfo[];
   userInfoListSubscription: Subscription;
   eventListProcessing$: Observable<boolean>;
   eventInfoStatus$: Observable<InfoResponse>;
+  eventRemain$: Observable<boolean>;
+  eventRemain = false;
   sessionVerInfo: VersionInfo2Response;
 
   isRecalledMessage = isRecalled;
@@ -148,8 +151,20 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewChecked {
       select(AppStore.MessengerSelector.EventSelector.infoListProcessing)
     );
 
+    this.eventRemain$ = this.store.pipe(
+      select(AppStore.MessengerSelector.EventSelector.remainInfo),
+      tap(remainInfo => {
+        this.eventRemain = remainInfo;
+      })
+    );
+
     this.eventList$ = this.store.pipe(
-      select(AppStore.MessengerSelector.EventSelector.selectAllInfoList)
+      select(AppStore.MessengerSelector.EventSelector.selectAllInfoList),
+      tap(infoList => {
+        if (!!infoList && infoList.length > 0) {
+          this.baseEventSeq = infoList[0].seq;
+        }
+      })
     );
 
     this.eventInfoStatus$ = this.store.pipe(
@@ -229,7 +244,7 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewChecked {
       return;
     }
 
-    if (message.trim().length > Maximum_Range.MassText) {
+    if (message.trim().length > CONST.MASSTEXT_LEN) {
       // MASS TEXT
       this.store.dispatch(
         EventStore.sendMass({
@@ -260,6 +275,22 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewChecked {
     this.store.dispatch(RoomStore.updateOnlyAlarm({ roomInfo: this.roomInfo }));
   }
 
+  onScrollup(event: any) {
+    this.onMoreEvent(this.baseEventSeq);
+  }
+  /** More Event */
+  onMoreEvent(seq: number) {
+    if (this.eventRemain) {
+      this.store.dispatch(
+        EventStore.info({
+          roomSeq: this.roomInfo.roomSeq,
+          baseSeq: seq,
+          requestCount: CONST.EVENT_INFO_READ_COUNT
+        })
+      );
+    }
+  }
+
   /** MassText Detail View */
   onMassDetail(value: number) {
     this.store.dispatch(
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
index d34019f3..a06301c8 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
@@ -29,6 +29,14 @@ export const infoSuccess = createAction(
   }>()
 );
 
+export const infoMoreSuccess = createAction(
+  '[Messenger::Event] Info More Success',
+  props<{
+    infoList: Info[];
+    res: InfoResponse;
+  }>()
+);
+
 export const infoFailure = createAction(
   '[Messenger::Event] Info Failure',
   props<{ error: any }>()
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
index a98800ea..e82da5aa 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
@@ -67,7 +67,8 @@ import {
   forwardFailure,
   forwardAfterRoomOpen,
   sendMass,
-  sendMassFailure
+  sendMassFailure,
+  infoMoreSuccess
 } from './actions';
 import { SessionStorageService } from '@ucap-webmessenger/web-storage';
 import {
@@ -81,6 +82,7 @@ import { openSuccess, openFailure } from '../room';
 import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
 import { KEY_LOGIN_RES_INFO } from '@app/types/login-res-info.type';
 import { StatusCode } from '@ucap-webmessenger/api';
+import { CONST } from '@ucap-webmessenger/core';
 
 @Injectable()
 export class Effects {
@@ -91,7 +93,7 @@ export class Effects {
         return info({
           roomSeq: action.roomSeq,
           baseSeq: 0,
-          requestCount: 50
+          requestCount: CONST.EVENT_INFO_READ_COUNT
         });
       })
     )
@@ -115,12 +117,21 @@ export class Effects {
                   break;
                 case SSVC_TYPE_EVENT_INFO_RES:
                   {
-                    this.store.dispatch(
-                      infoSuccess({
-                        infoList,
-                        res: res as InfoResponse
-                      })
-                    );
+                    if (req.baseSeq === 0) {
+                      this.store.dispatch(
+                        infoSuccess({
+                          infoList,
+                          res: res as InfoResponse
+                        })
+                      );
+                    } else {
+                      this.store.dispatch(
+                        infoMoreSuccess({
+                          infoList,
+                          res: res as InfoResponse
+                        })
+                      );
+                    }
 
                     if (req.baseSeq === 0) {
                       // 최초 이벤트 목록 조회시 SSVC_TYPE_EVENT_READ_REQ 수행.
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/reducers.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/reducers.ts
index 39378335..ee6c3be2 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/reducers.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/reducers.ts
@@ -6,10 +6,12 @@ import {
   info,
   infoFailure,
   recallInfoList,
-  delInfoList
+  delInfoList,
+  infoMoreSuccess
 } from './actions';
 import * as AuthenticationStore from '@app/store/account/authentication';
 import { Info, EventType } from '@ucap-webmessenger/protocol-event';
+import { CONST } from '@ucap-webmessenger/core';
 
 export const reducer = createReducer(
   initialState,
@@ -27,7 +29,27 @@ export const reducer = createReducer(
         ...state.infoList
       }),
       infoStatus: action.res,
-      infoListProcessing: false
+      infoListProcessing: false,
+      remainInfo:
+        !!action.infoList &&
+        action.infoList.length === CONST.EVENT_INFO_READ_COUNT
+          ? true
+          : false
+    };
+  }),
+  on(infoMoreSuccess, (state, action) => {
+    return {
+      ...state,
+      infoList: adapterInfoList.upsertMany(action.infoList, {
+        ...state.infoList
+      }),
+      infoStatus: action.res,
+      infoListProcessing: false,
+      remainInfo:
+        !!action.infoList &&
+        action.infoList.length === CONST.EVENT_INFO_READ_COUNT
+          ? true
+          : false
     };
   }),
 
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/state.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/state.ts
index fe1cc060..e799ee2c 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/state.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/state.ts
@@ -8,6 +8,7 @@ export interface State {
   infoListProcessing: boolean;
   infoList: InfoListState;
   infoStatus: InfoResponse | null;
+  remainInfo: boolean;
 }
 
 export const adapterInfoList = createEntityAdapter<Info>({
@@ -22,7 +23,8 @@ const infoListInitialState: InfoListState = adapterInfoList.getInitialState({});
 export const initialState: State = {
   infoListProcessing: false,
   infoList: infoListInitialState,
-  infoStatus: null
+  infoStatus: null,
+  remainInfo: false
 };
 
 const {
@@ -43,6 +45,10 @@ export function selectors<S>(selector: Selector<any, State>) {
       selector,
       (state: State) => state.infoListProcessing
     ),
+    remainInfo: createSelector(
+      selector,
+      (state: State) => state.remainInfo
+    ),
     infoList: createSelector(
       selector,
       (state: State) => state.infoList
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
index cc5add6d..a9938e06 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
@@ -101,6 +101,7 @@ import {
 
 import * as ChatStore from '@app/store/messenger/chat';
 import * as RoomStore from '@app/store/messenger/room';
+import { CONST } from '@ucap-webmessenger/core';
 
 @Injectable()
 export class Effects {
@@ -405,7 +406,7 @@ export class Effects {
                   divCd: 'DivCodeT',
                   roomName: '',
                   isTimerRoom: true,
-                  timerRoomInterval: 24 * 60 * 60, // 24h default
+                  timerRoomInterval: CONST.DEFAULT_TIMER_ROOM_INTERVAL, // 24h default
                   userSeqs: userSeqList
                 }
               })
diff --git a/projects/ucap-webmessenger-core/src/lib/type/const.type.ts b/projects/ucap-webmessenger-core/src/lib/type/const.type.ts
new file mode 100644
index 00000000..0e94076c
--- /dev/null
+++ b/projects/ucap-webmessenger-core/src/lib/type/const.type.ts
@@ -0,0 +1,10 @@
+export enum CONST {
+  /** 대용량 텍스트로 보내는 문자열의 길이 기준 */
+  MASSTEXT_LEN = 800,
+  /** 대화방의 이벤트를 조회하는 개수 */
+  EVENT_INFO_READ_COUNT = 50,
+  /** Timer Room 최초 오픈시 timer interval */
+  DEFAULT_TIMER_ROOM_INTERVAL = 24 * 60 * 60,
+  /** 한번에 채팅을 할 수 있는 인원수 제한 */
+  CHATROOM_USER = 300
+}
diff --git a/projects/ucap-webmessenger-core/src/lib/type/maximum-range.type.ts b/projects/ucap-webmessenger-core/src/lib/type/maximum-range.type.ts
deleted file mode 100644
index ad1c7d03..00000000
--- a/projects/ucap-webmessenger-core/src/lib/type/maximum-range.type.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-export enum Maximum_Range {
-  MassText = 800,
-  ChatRoom = 300
-}
diff --git a/projects/ucap-webmessenger-core/src/public-api.ts b/projects/ucap-webmessenger-core/src/public-api.ts
index e02f3957..530adf92 100644
--- a/projects/ucap-webmessenger-core/src/public-api.ts
+++ b/projects/ucap-webmessenger-core/src/public-api.ts
@@ -7,12 +7,12 @@ export * from './lib/type/call-alarm.type';
 export * from './lib/type/call-forward.type';
 export * from './lib/type/call-mode.type';
 export * from './lib/type/caller-type.type';
+export * from './lib/type/const.type';
 export * from './lib/type/default-screen.type';
 export * from './lib/type/device-devision.type';
 export * from './lib/type/device-type.type';
 export * from './lib/type/file-transfer-permissions.type';
 export * from './lib/type/locale-code.type';
-export * from './lib/type/maximum-range.type';
 export * from './lib/type/notification-method.type';
 export * from './lib/type/organization-chart-permissions.type';
 export * from './lib/type/push-type.type';
diff --git a/projects/ucap-webmessenger-protocol-event/src/lib/protocols/info.ts b/projects/ucap-webmessenger-protocol-event/src/lib/protocols/info.ts
index 9c3c9d9a..397c693b 100644
--- a/projects/ucap-webmessenger-protocol-event/src/lib/protocols/info.ts
+++ b/projects/ucap-webmessenger-protocol-event/src/lib/protocols/info.ts
@@ -35,8 +35,6 @@ export interface InfoResponse extends ProtocolResponse {
   baseSeq: number;
   // 유효한파일기준이벤트SEQ(n)
   validFileBaseSeq: number;
-  // 이벤트정보 개수(n)
-  count: number;
 }
 
 export const encodeInfo: ProtocolEncoder<InfoRequest> = (req: InfoRequest) => {
@@ -82,7 +80,6 @@ export const decodeInfo: ProtocolDecoder<InfoResponse> = (
   return decodeProtocolMessage(message, {
     roomSeq: message.bodyList[0],
     baseSeq: message.bodyList[1],
-    validFileBaseSeq: message.bodyList[2],
-    count: message.bodyList[3]
+    validFileBaseSeq: message.bodyList[2]
   } as InfoResponse);
 };
diff --git a/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.html b/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.html
index 4def8769..e0a507d8 100644
--- a/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.html
+++ b/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.html
@@ -1,4 +1,7 @@
 <div class="chat-messages">
+  <!-- <div class="message-row" *ngIf="eventRemain">
+    <button mat-button (click)="onClickMore($event)">이전 대화 보기</button>
+  </div> -->
   <!-- MESSAGE -->
   <div
     *ngFor="let message of messages; let i = index"
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 d3d43a79..85c06a0b 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
@@ -1,3 +1,4 @@
+import { CONST } from '@ucap-webmessenger/core';
 import {
   Component,
   OnInit,
@@ -32,17 +33,20 @@ export class MessagesComponent implements OnInit {
   @Input()
   eventInfoStatus?: InfoResponse;
   @Input()
+  eventRemain: boolean;
+  @Input()
   userInfos?: UserInfo[];
   @Input()
   sessionVerInfo: VersionInfo2Response;
 
+  @Output()
+  moreEvent = new EventEmitter<number>();
   @Output()
   massDetail = new EventEmitter<number>();
   @Output()
   imageViewer = new EventEmitter<FileInfo>();
   @Output()
   save = new EventEmitter<{ fileInfo: FileInfo; type: string }>();
-
   @Output()
   contextMenu = new EventEmitter<{
     event: MouseEvent;
@@ -50,6 +54,7 @@ export class MessagesComponent implements OnInit {
   }>();
 
   EventType = EventType;
+  CONST = CONST;
   profileImageRoot: string;
 
   constructor(private logger: NGXLogger, private datePipe: DatePipe) {}
@@ -138,6 +143,13 @@ export class MessagesComponent implements OnInit {
     return false;
   }
 
+  onClickMore(event: any) {
+    event.preventDefault();
+    event.stopPropagation();
+
+    this.moreEvent.emit(this.messages[0].seq);
+  }
+
   /** [Event] MassTalk Detail View */
   onMassDetail(value: number) {
     this.massDetail.emit(value);