diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index 1851beb..a045461 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -40,14 +40,15 @@ export class AppComponent implements OnInit, AfterContentInit, AfterViewInit, On
     this.showTitleBar = false;
     this.block = false;
 
-    // this.translateService.onLangChange.subscribe(() => {
-    //   this.changeDetector.detectChanges();
+    this.translateService.addLangs(['en', 'ko']);
+    this.translateService.setDefaultLang('en');
+    // this.translateService.onLangChange.subscribe((e) => {
+    //   this.changeDetector.markForCheck();
     // });
-    // this.translateService.onTranslationChange.subscribe(() => {
+    // this.translateService.onTranslationChange.subscribe((e) => {
     //   this.changeDetector.detectChanges();
     // });
 
-    this.translateService.setDefaultLang('en');
 
     // const i18ns = ['en', 'ko'];
     // i18ns.forEach((lang) => {
@@ -67,6 +68,7 @@ export class AppComponent implements OnInit, AfterContentInit, AfterViewInit, On
     this.menuSubscription = this.electronProxyService.menuObservable()
       .pipe(
         map((name: MenuEvent) => {
+          let requireDetectChanges = true;
           switch (name) {
             case 'show-about':
               this.displayAbout = true;
@@ -87,15 +89,23 @@ export class AppComponent implements OnInit, AfterContentInit, AfterViewInit, On
               this.displayPrint = true;
               break;
             case 'change-language-english':
-              this.translateService.use('en');
+              requireDetectChanges = false;
+              this.translateService.use('en').pipe(take(1)).subscribe((res: any) => {
+                __this.changeDetector.detectChanges();
+              });
               break;
             case 'change-language-korean':
-              this.translateService.use('ko');
+              requireDetectChanges = false;
+              this.translateService.use('ko').pipe(take(1)).subscribe((res: any) => {
+                __this.changeDetector.detectChanges();
+              });
               break;
             default:
               break;
           }
-          __this.changeDetector.detectChanges();
+          if (requireDetectChanges) {
+            __this.changeDetector.detectChanges();
+          }
         }),
         catchError(error => {
           return of(error);
diff --git a/src/app/service/i18n.service.ts b/src/app/service/i18n.service.ts
index 47de228..8e78f6a 100644
--- a/src/app/service/i18n.service.ts
+++ b/src/app/service/i18n.service.ts
@@ -4,9 +4,7 @@ import { Observable, of } from 'rxjs';
 import { TranslateLoader } from '@ngx-translate/core';
 import { ElectronProxyService } from './electron-proxy.service';
 
-@Injectable({
-  providedIn: 'root'
-})
+@Injectable()
 export class I18nService extends TranslateLoader {
   private prefix: string;
   private suffix: string;