diff --git a/app/pages/inspection/index.vue b/app/pages/inspection/index.vue
index 714d1fc..4c55e25 100644
--- a/app/pages/inspection/index.vue
+++ b/app/pages/inspection/index.vue
@@ -1,6 +1,6 @@
 <template>
   <header class="header">
-    <BlocksStoveGnbNew class="min-h-[48px]" />
+    <BlocksStoveGnb class="min-h-[48px]" />
   </header>
   <section class="inspection-section">
     <clientOnly>
diff --git a/i18n.config.ts b/i18n.config.ts
index a84d8d8..7f1cf93 100644
--- a/i18n.config.ts
+++ b/i18n.config.ts
@@ -1,7 +1,6 @@
 import type { LocaleObject, NuxtI18nOptions } from '@nuxtjs/i18n'
 
-// const LANG_DIR: string = './i18n/locales'
-
+const LANG_DIR: string = '../i18n/locales'
 const DEFAULT_COVERAGES: string[] = ['ko', 'en', 'ja', 'zh-tw', 'zh-cn', 'th']
 const DEFAULT_LOCALES: Record<string, LocaleObject> = {
   ko: { code: 'ko', name: '한국어', iso: 'ko-KR', dir: 'ltr' },
@@ -40,12 +39,10 @@ const getI18n = (allowedLangCodes?: string[]): NuxtI18nOptions => {
     defaultLocale: DEFAULT_LOCALE_CODE,
     detectBrowserLanguage: {
       fallbackLocale: DEFAULT_LOCALE_CODE,
-      useCookie: true,
-      cookieKey: 'LOCALE',
-      cookieDomain: process.env.BASE_DOMAIN,
+      useCookie: false,
       redirectOn: 'root',
     },
-    langDir: '../i18n/locales',
+    langDir: LANG_DIR,
     compilation: {
       strictMessage: false,
       escapeHtml: false,
diff --git a/layers/components/blocks/StoveGnb.vue b/layers/components/blocks/StoveGnb.vue
index 8577a5a..e9b8d98 100644
--- a/layers/components/blocks/StoveGnb.vue
+++ b/layers/components/blocks/StoveGnb.vue
@@ -1,72 +1,66 @@
 <script setup lang="ts">
-import { useGameDataStore } from '#layers/stores/useGameDataStore'
-
-let cpHeader: any = null
-
-const runtimeConfig = useRuntimeConfig()
-const { locale, availableLocales } = useI18n()
-const gameDataStore = useGameDataStore()
-
-const { gameData } = storeToRefs(gameDataStore)
-
-const stoveInflowPath = runtimeConfig.public.stoveInflowPath
-const stoveGameNo = runtimeConfig.public.stoveGameNo
-const stoveGnbData = gameData.value?.stove_gnb_json
-
-const languageCodes = computed(() => {
-  if (Array.isArray(availableLocales)) {
-    return availableLocales.map(
-      (localeCode: any) => localeCode.code ?? localeCode
-    )
-  }
-  return [locale]
-})
-
-const loadGnb = (locale: string) => {
-  locale = locale.toLowerCase()
-
-  const gnbOption = {
-    wrapper: '#stove-wrap',
-    isResponsive: true,
-    skin: 'gnb-dark-mini',
-    widget: {
-      gameListAndService: false,
-      languageSelect: false,
-      notification: stoveGnbData?.notify_icon_visible ?? true,
-      stoveDownload: false,
-    },
-    global: {
-      userGds: true,
-      defaultSelectedLanguage: locale ?? 'en',
-      languageCoverages: languageCodes.value,
-    },
-    loginMethod: {
-      params: {
-        inflow_path: stoveInflowPath,
-        game_no: stoveGameNo,
-        show_play_button: stoveGnbData?.stove_install_button_visible ?? 'Y',
-      },
-      redirectCurrentPage: true,
-      windowTitle: undefined,
-    },
-  }
-
-  cpHeader = new (window as any).cp.Header(gnbOption)
-  cpHeader.render()
-}
+let mountedInstance: any = null
 
 onMounted(() => {
-  loadGnb(locale.value)
+  const gameDataStore = useGameDataStore()
+
+  const { gameData } = storeToRefs(gameDataStore)
+  const langCodes = gameData.value?.lang_codes
+  const defaultLangCode = gameData.value?.default_lang_code
+  const stoveGnbData = gameData.value?.stove_gnb_json
+  const designTheme = gameData.value?.design_theme
+  const currentDomain =
+    window.location.protocol + '//' + window.location.hostname
+
+  if (typeof window !== 'undefined' && (window as any).StoveGnb) {
+    const stoveGnbOptions = {
+      logArea: currentDomain,
+      useLanguageCodeFromPath: true,
+      serviceTitle: {
+        pc: '',
+        mobile: '',
+      },
+      widget: {
+        notification: stoveGnbData?.notify_icon_visible ?? true,
+        stoveDownload: stoveGnbData?.stove_install_button_visible ?? true,
+        languageSelect: false,
+        themeSelect: false,
+        stoveMenu: {
+          active: false,
+          mobile: true,
+        },
+      },
+      global: {
+        languageCoverages: langCodes,
+        defaultSelectedLanguage: defaultLangCode ?? 'ko',
+      },
+      loginMethod: {
+        redirectCurrentPage: true,
+      },
+      mode: {
+        theme: {
+          support: designTheme === 1 ? ['light'] : ['dark'],
+          default: designTheme === 1 ? 'light' : 'dark',
+        },
+        mini: true,
+        layout: 'wide',
+        fixed: false,
+      },
+    }
+    mountedInstance = (window as any).StoveGnb.mount(
+      '#stove-wrap',
+      stoveGnbOptions
+    )
+  }
 })
 
 onBeforeUnmount(() => {
-  if (cpHeader && typeof cpHeader.destroy === 'function') {
-    cpHeader.destroy()
+  if (mountedInstance && typeof mountedInstance.destroy === 'function') {
+    mountedInstance.destroy()
   }
-  cpHeader = null
+  mountedInstance = null
 })
 </script>
-
 <template>
-  <div id="stove-wrap" class="relative z-[5]" />
+  <div id="stove-wrap" class="relative h-[48px] z-[5]" />
 </template>
diff --git a/layers/components/blocks/StoveGnbNew.vue b/layers/components/blocks/StoveGnbNew.vue
deleted file mode 100644
index 4f63991..0000000
--- a/layers/components/blocks/StoveGnbNew.vue
+++ /dev/null
@@ -1,79 +0,0 @@
-<script setup lang="ts">
-let mountedInstance: any = null
-const runtimeConfig = useRuntimeConfig()
-const baseDomain = `${runtimeConfig.public.baseDomain}`
-
-onMounted(() => {
-  const gameDataStore = useGameDataStore()
-  const { gameData } = storeToRefs(gameDataStore)
-  const langCodes = gameData.value?.lang_codes
-  const defaultLangCode = gameData.value?.default_lang_code
-  const stoveGnbData = gameData.value?.stove_gnb_json
-  const designTheme = gameData.value?.design_theme
-
-  const currentDomain =
-    window.location.protocol + '//' + window.location.hostname
-  if (typeof window !== 'undefined' && (window as any).StoveGnb) {
-    const stoveGnbOptions = {
-      logArea: currentDomain,
-      useLanguageCodeFromPath: false,
-      serviceTitle: {
-        pc: '',
-        mobile: '',
-      },
-      widget: {
-        notification: stoveGnbData?.notify_icon_visible ?? true,
-        stoveDownload: stoveGnbData?.stove_install_button_visible ?? true,
-        languageSelect: false,
-        themeSelect: false,
-        stoveMenu: {
-          active: false,
-          mobile: true,
-        },
-      },
-      global: {
-        languageCoverages: langCodes,
-        defaultSelectedLanguage: defaultLangCode ?? 'en',
-      },
-      loginMethod: {
-        redirectCurrentPage: true,
-      },
-      mode: {
-        theme: {
-          support: designTheme === 1 ? ['light'] : ['dark'],
-          default: designTheme === 1 ? 'light' : 'dark',
-        },
-        mini: true,
-        layout: 'wide',
-        fixed: false,
-      },
-    }
-    mountedInstance = (window as any).StoveGnb.mount(
-      '#stove-wrap',
-      stoveGnbOptions
-    )
-  }
-  if (mountedInstance) {
-    //Stove GNB에서도 쿠키를 굽고 있어 소문자로 통일
-    //LOCALE 쿠키를 가져온 후 소문자로 변경해서 다시 LOCALE 쿠키를 설정
-    nextTick(() => {
-      const localeCookie = useCookie('LOCALE', {
-        domain: baseDomain,
-        path: '/',
-        maxAge: 60 * 60 * 24 * 365, // 1년 (초 단위)
-      })
-      localeCookie.value = localeCookie.value.toLowerCase()
-    })
-  }
-})
-
-onBeforeUnmount(() => {
-  if (mountedInstance && typeof mountedInstance.destroy === 'function') {
-    mountedInstance.destroy()
-  }
-  mountedInstance = null
-})
-</script>
-<template>
-  <div id="stove-wrap" class="relative h-[48px] z-[5]" />
-</template>
diff --git a/layers/components/layouts/Header.vue b/layers/components/layouts/Header.vue
index 5fb92d9..01dc933 100644
--- a/layers/components/layouts/Header.vue
+++ b/layers/components/layouts/Header.vue
@@ -180,7 +180,7 @@ onMounted(() => {
 
 <template>
   <header :class="['header', { 'empty-game': !gnbData }]">
-    <BlocksStoveGnbNew class="h-[48px]" />
+    <BlocksStoveGnb class="h-[48px]" />
     <div
       v-if="gnbData"
       :class="['game-wrap', { 'is-fixed': isPassedStoveGnb }]"
diff --git a/layers/components/layouts/StoveHeader.vue b/layers/components/layouts/StoveHeader.vue
index 7af3e51..835b5cd 100644
--- a/layers/components/layouts/StoveHeader.vue
+++ b/layers/components/layouts/StoveHeader.vue
@@ -2,7 +2,7 @@
 
 <template>
   <header class="header">
-    <BlocksStoveGnbNew class="min-h-[48px]" />
+    <BlocksStoveGnb class="min-h-[48px]" />
   </header>
 </template>
 
diff --git a/layers/composables/useGameStart.ts b/layers/composables/useGameStart.ts
index b02b21c..e8e763e 100644
--- a/layers/composables/useGameStart.ts
+++ b/layers/composables/useGameStart.ts
@@ -3,11 +3,11 @@ import { useTokenValidation } from '#layers/composables/useTokenValidation'
 import { csrGoStoveLogin } from '#layers/utils/stoveUtil'
 
 export const useCheckGameStart = () => {
-  const { tm } = useI18n()
   const runtimeConfig = useRuntimeConfig()
   const gameDataStore = useGameDataStore()
   const modalStore = useModalStore()
   const { handleTokenValidation } = useTokenValidation()
+  const { tm, locale } = useI18n()
 
   const { gameData } = storeToRefs(gameDataStore)
 
@@ -21,6 +21,11 @@ export const useCheckGameStart = () => {
   // 에러 처리
   const errorHandler = (errorCode: number) => {
     switch (errorCode) {
+      case -100: // Window OS에서만 실행 가능
+        modalStore.handleOpenAlert({
+          contentText: tm('Alert_Client_Window'),
+        })
+        break
       case 601: // PC 클라이언트 미설치
         break
       case 40101: // 로그인 정보 확인 중 오류가 발생했습니다. 재로그인 후 다시 이용해 주세요.
@@ -117,7 +122,7 @@ export const useCheckGameStart = () => {
     const accessTokenSub = csrGetAccessToken()
     const stoveGameId = gameData.value?.game_id || ''
     const nationCookie = useCookie('NNTO').value
-    const localeCookie = useCookie('LOCALE').value
+    const localeCode = locale.value.toUpperCase() || 'KO'
 
     window.stoveJsService = window.stoveJsService || {}
 
@@ -138,7 +143,7 @@ export const useCheckGameStart = () => {
       .run({
         gameId: stoveGameId,
         nation: nationCookie,
-        lang: localeCookie,
+        lang: localeCode,
         isSkipMaintenance: true,
       })
       .then(() => {
@@ -166,9 +171,7 @@ export const useCheckGameStart = () => {
 
     const isWindowsOS = checkWindowsOS()
     if (!isWindowsOS) {
-      modalStore.handleOpenAlert({
-        contentText: tm('Alert_Client_Window'),
-      })
+      errorHandler(-100)
       return
     }
 
diff --git a/layers/middleware/inspection.ts b/layers/middleware/inspection.ts
index e2710a9..5f2bb38 100644
--- a/layers/middleware/inspection.ts
+++ b/layers/middleware/inspection.ts
@@ -19,12 +19,7 @@ export default defineNuxtRouteMiddleware(async to => {
     // const stoveMaintenanceApiUrl = `${runtimeConfig.public.stoveMaintenanceApiUrl}`
     const stoveGameId = gameData.value.game_id
 
-    /* const localeCookie = useCookie('LOCALE', {
-      domain: baseDomain
-    }) */
-
     const finalLocale = csrGetFinalLocale(to.path, gameData.value.lang_codes)
-    // localeCookie.value = finalLocale.toUpperCase()
 
     // 웹 점검 -----
     const { isWebInspection, getInspectionDataExternal } =
diff --git a/layers/server/middleware/gameData.ts b/layers/server/middleware/gameData.ts
index 8a572ce..5559f45 100644
--- a/layers/server/middleware/gameData.ts
+++ b/layers/server/middleware/gameData.ts
@@ -1,5 +1,5 @@
 import { LRUCache } from 'lru-cache'
-import { defineEventHandler, createError, setCookie, type H3Event } from 'h3'
+import { defineEventHandler, createError, type H3Event } from 'h3'
 import {
   getGameDomain,
   getPathLocale,
@@ -71,25 +71,6 @@ const cache = new LRUCache<string, WebInspectionData>({
   ttl: 1000 * 30, // 30초 동안 캐시 유지
 })
 
-/**
- * 최종 언어 쿠키 세팅
- *
- * @param event - 이벤트 객체
- * @param finalLocale - 최종 언어
- * @param baseDomain - 기본 도메인
- */
-function setFinalLocaleCookie(
-  event: H3Event,
-  finalLocale: string,
-  baseDomain: string
-) {
-  setCookie(event, 'LOCALE', finalLocale.toLowerCase(), {
-    domain: baseDomain,
-    path: '/',
-    maxAge: 60 * 60 * 24 * 365, // 1년 (초 단위)
-  })
-}
-
 /**
  * Locale Middleware 역할 함수
  *
@@ -201,20 +182,7 @@ export default defineEventHandler(async event => {
     // 1-1. 정적 파일 패스
     if (isStaticFile(event.path)) return
 
-    // 1-2. /inspection 패스
-    if (fullPath.includes('/inspection')) {
-      // 리턴 되기 전 언어 쿠키 세팅
-      const finalLocale = ssrGetFinalLocale(
-        event?.node.req.url,
-        event.node.req.headers,
-        gameDataLangCodes,
-        gameDataDefaultLocale
-      )
-      setFinalLocaleCookie(event, finalLocale, baseDomain)
-      return
-    }
-
-    // 1-3. 특정 경로 패스 (API, 리소스)
+    // 1-2. 특정 경로 패스 (API, 리소스)
     if (shouldSkipPath(fullPath)) return
 
     // 캐시 키 생성 (게임 ID 포함하여 충돌 방지)
@@ -229,7 +197,6 @@ export default defineEventHandler(async event => {
         gameDataLangCodes,
         gameDataDefaultLocale
       )
-      setFinalLocaleCookie(event, finalLocale, baseDomain)
 
       // 초기화
       let inspectionData
diff --git a/layers/utils/localeUtil.ts b/layers/utils/localeUtil.ts
index 1474d28..20b9ec1 100644
--- a/layers/utils/localeUtil.ts
+++ b/layers/utils/localeUtil.ts
@@ -38,15 +38,6 @@ export const csrGetFinalLocale = (path = '', coveragesLocales: string[]) => {
 
   let finalLocale = DEFAULT_LOCALE_CODE // 기본값 설정
 
-  // coveragesLocales가 빈 배열이거나 유효하지 않은 경우 기본 언어 반환
-  if (
-    !coveragesLocales ||
-    !Array.isArray(coveragesLocales) ||
-    coveragesLocales.length === 0
-  ) {
-    return finalLocale
-  }
-
   // 1. URL 패스에 포함된 언어
   if (path && path !== '' && path.split('/').length > 1) {
     // 쿼리스트링 제거한 순수 path 검사
@@ -56,7 +47,11 @@ export const csrGetFinalLocale = (path = '', coveragesLocales: string[]) => {
     const pathLocale = `${path.split('/')[1]}`.toLowerCase()
 
     // URL 패스에 포함된 언어가 지원하는 언어인지 체크
-    if (pathLocale && pathLocale !== '') {
+    if (
+      pathLocale &&
+      pathLocale !== '' &&
+      coveragesLocales.includes(pathLocale)
+    ) {
       finalLocale = pathLocale
       return finalLocale
     }
@@ -66,23 +61,25 @@ export const csrGetFinalLocale = (path = '', coveragesLocales: string[]) => {
   // 2. LOCALE 쿠키 언어
   const cookieLanguage =
     `${useCookie('LOCALE', { domain: baseDomain }).value}`.toLowerCase()
-  if (cookieLanguage && cookieLanguage !== '') {
+  if (
+    cookieLanguage &&
+    cookieLanguage !== '' &&
+    coveragesLocales.includes(cookieLanguage)
+  ) {
     finalLocale = cookieLanguage
     return finalLocale
   }
 
   // 3. 브라우저 언어
-  if (import.meta.client) {
-    const browserLanguage =
-      `${navigator.language || navigator.languages[0]}`.toLowerCase()
-    if (
-      browserLanguage &&
-      browserLanguage !== '' &&
-      coveragesLocales.includes(browserLanguage)
-    ) {
-      finalLocale = browserLanguage
-      return finalLocale
-    }
+  const browserLanguage =
+    `${navigator.language || navigator.languages[0]}`.toLowerCase()
+  if (
+    browserLanguage &&
+    browserLanguage !== '' &&
+    coveragesLocales.includes(browserLanguage)
+  ) {
+    finalLocale = browserLanguage
+    return finalLocale
   }
 
   // 3. 서비스 기본 언어
@@ -98,7 +95,7 @@ export const csrGetFinalLocale = (path = '', coveragesLocales: string[]) => {
  * @param {any} headers - 요청 헤더
  */
 export const ssrGetFinalLocale = (
-  path,
+  path = '',
   headers: any,
   coveragesLocales: string[],
   defaultLocale: string