diff --git a/package.json b/package.json
index 4e409a5..5b0cba3 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,6 @@
     "@next/bundle-analyzer": "16.1.1",
     "@next/mdx": "16.1.1",
     "codehike": "1.0.7",
-    "cookie": "^1.1.1",
     "dayjs": "^1.11.19",
     "jotai": "^2.16.0",
     "lucide-react": "^0.562.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 505d6b5..272ce2e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -33,9 +33,6 @@ importers:
       codehike:
         specifier: 1.0.7
         version: 1.0.7
-      cookie:
-        specifier: ^1.1.1
-        version: 1.1.1
       dayjs:
         specifier: ^1.11.19
         version: 1.11.19
@@ -1489,10 +1486,6 @@ packages:
   convert-source-map@2.0.0:
     resolution: {integrity: sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==}
 
-  cookie@1.1.1:
-    resolution: {integrity: sha512-ei8Aos7ja0weRpFzJnEA9UHJ/7XQmqglbRwnf2ATjcB9Wq874VKH9kfjjirM6UhU2/E5fFYadylyhFldcqSidQ==}
-    engines: {node: '>=18'}
-
   cross-spawn@7.0.6:
     resolution: {integrity: sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==}
     engines: {node: '>= 8'}
@@ -4709,8 +4702,6 @@ snapshots:
 
   convert-source-map@2.0.0: {}
 
-  cookie@1.1.1: {}
-
   cross-spawn@7.0.6:
     dependencies:
       path-key: 3.1.1
diff --git a/src/app/article/2024-10/check-target/tester.tsx b/src/app/article/2024-10/check-target/tester.tsx
index 821cfed..b7a3eae 100644
--- a/src/app/article/2024-10/check-target/tester.tsx
+++ b/src/app/article/2024-10/check-target/tester.tsx
@@ -98,7 +98,7 @@ export const Tester: React.FC = () => {
 
   return (
     <div className="space-y-4">
-      <div className="rounded-large border border-transparent shadow-small dark:border-gray-600">
+      <div className="rounded-large shadow-small border border-transparent dark:border-gray-600">
         <div className="flex items-center justify-between gap-4 px-4 pt-4">
           <h3 className="font-medium">립스틱 배너 조건 설정 (AND)</h3>
           <div className="flex gap-2">
@@ -171,7 +171,10 @@ export const Tester: React.FC = () => {
                             value={target.operator}
                             onChange={(value) => {
                               const newTargets = [...targets];
-                              newTargets[index] = { ...target, operator: value };
+                              newTargets[index] = {
+                                ...target,
+                                operator: value,
+                              };
                               setTargets(newTargets);
                             }}
                           />{" "}
@@ -225,7 +228,7 @@ export const Tester: React.FC = () => {
           <pre className="text-xs">{JSON.stringify(root, null, 2)}</pre>
         </div>
         <div>
-          <div className="mb-4 rounded-large border border-transparent shadow-small dark:border-gray-600">
+          <div className="rounded-large shadow-small mb-4 border border-transparent dark:border-gray-600">
             <div className="px-4 pt-4">
               <h3 className="font-medium">방문자</h3>
             </div>
diff --git a/src/app/set-locale/route.ts b/src/app/set-locale/route.ts
deleted file mode 100644
index 659ccdc..0000000
--- a/src/app/set-locale/route.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import { NextResponse } from "next/server";
-import { i18n, type Locale } from "@/modules/i18n/types";
-
-export async function GET(req: Request) {
-  const { searchParams } = new URL(req.url);
-  const locale = searchParams.get("locale") as Locale | null;
-  const to = searchParams.get("to") || "/";
-
-  if (!locale || !(i18n.locales as readonly string[]).includes(locale)) {
-    return NextResponse.redirect(new URL(to, req.url));
-  }
-
-  const res = NextResponse.redirect(new URL(to, req.url));
-  res.cookies.set("locale", locale, {
-    path: "/",
-    maxAge: 60 * 60 * 24 * 365, // 1y
-    sameSite: "lax",
-  });
-  return res;
-}
diff --git a/src/modules/article/ArticleHeader.tsx b/src/modules/article/ArticleHeader.tsx
index 982dbaf..bff1fd4 100644
--- a/src/modules/article/ArticleHeader.tsx
+++ b/src/modules/article/ArticleHeader.tsx
@@ -41,7 +41,7 @@ export default function ArticleHeader({
     if (available.length >= 2) {
       languageLinks = available.map((l) => ({
         locale: l,
-        href: `/set-locale?locale=${l}&to=/${l}/${slug}`,
+        href: `/${l}/${slug}`,
       }));
     }
   } catch {
diff --git a/src/modules/i18n/useLocale.ts b/src/modules/i18n/useLocale.ts
index 9fe4162..e935abe 100644
--- a/src/modules/i18n/useLocale.ts
+++ b/src/modules/i18n/useLocale.ts
@@ -2,24 +2,16 @@
 
 import { i18n, type Locale } from "@/modules/i18n/types";
 import { usePathname } from "next/navigation";
-import { getLocaleFromPathname, isLocale } from "./util";
-import * as cookie from "cookie";
-
-function getLocaleFromCookie(): Locale | null {
-  if (typeof document === "undefined") {
-    return null;
-  }
-
-  const cookies = cookie.parse(document.cookie);
-  const localeRaw = cookies.locale || "";
-  return isLocale(localeRaw) ? localeRaw : null;
-}
+import { getLocaleFromPathname } from "./util";
 
+/**
+ * URL pathname 기반으로 locale을 결정합니다.
+ * - /ko/... 또는 /en/... 경로: 해당 locale 사용
+ * - 그 외 모든 경로: 기본 locale(ko) 사용
+ *
+ * 쿠키 기반 locale은 사용하지 않습니다. (일관성 유지)
+ */
 export function useLocale(): Locale {
   const pathname = usePathname();
-  const localeFromCooikie = getLocaleFromCookie();
-
-  return (
-    getLocaleFromPathname(pathname) || localeFromCooikie || i18n.defaultLocale
-  );
+  return getLocaleFromPathname(pathname) ?? i18n.defaultLocale;
 }
diff --git a/src/proxy.ts b/src/proxy.ts
index aba3700..74ab948 100644
--- a/src/proxy.ts
+++ b/src/proxy.ts
@@ -40,7 +40,6 @@ export default function proxy(req: NextRequest) {
     pathname.startsWith("/_next") ||
     pathname.match(/\.[^/]+$/) ||
     seg1 === "api" ||
-    seg1 === "set-locale" ||
     (i18n.locales as readonly string[]).includes(seg1)
   ) {
     return NextResponse.next();