diff --git a/apps/timo-web/app/[locale]/(main)/settings/_containers/SettingsTabsContainer.tsx b/apps/timo-web/app/[locale]/(main)/settings/_containers/SettingsTabsContainer.tsx
index 7f070be4..fe1fba6e 100644
--- a/apps/timo-web/app/[locale]/(main)/settings/_containers/SettingsTabsContainer.tsx
+++ b/apps/timo-web/app/[locale]/(main)/settings/_containers/SettingsTabsContainer.tsx
@@ -4,11 +4,16 @@ import { SettingsProfileContainer } from "@/app/[locale]/(main)/settings/_contai
 import { useSettingsTab } from "@/app/[locale]/(main)/settings/_hooks/useSettingsTab";
 import { SettingsPolicyContainer } from "@/app/[locale]/(main)/settings/policy/_containers/SettingsPolicyContainer";
 import { SettingsWithdrawalContainer } from "@/app/[locale]/(main)/settings/withdrawal/_containers/SettingsWithdrawalContainer";
+import { AsyncBoundary } from "@/components/boundary/AsyncBoundary";
 
 export const SettingsTabsContainer = () => {
   const tab = useSettingsTab();
 
   if (tab === "policy") return <SettingsPolicyContainer />;
   if (tab === "withdrawal") return <SettingsWithdrawalContainer />;
-  return <SettingsProfileContainer />;
+  return (
+    <AsyncBoundary>
+      <SettingsProfileContainer />
+    </AsyncBoundary>
+  );
 };
diff --git a/apps/timo-web/app/[locale]/(main)/settings/_hooks/useSettingsProfile.ts b/apps/timo-web/app/[locale]/(main)/settings/_hooks/useSettingsProfile.ts
index 1fcf8707..6fdcd48b 100644
--- a/apps/timo-web/app/[locale]/(main)/settings/_hooks/useSettingsProfile.ts
+++ b/apps/timo-web/app/[locale]/(main)/settings/_hooks/useSettingsProfile.ts
@@ -6,12 +6,22 @@ import { useForm } from "react-hook-form";
 
 import type {
   SettingsDefaultTagKey,
-  SettingsProfile,
+  SettingsLanguage,
   SettingsProfileFormValues,
 } from "@/app/[locale]/(main)/settings/_types/profile-type";
 
+import { useUpdateLanguage } from "@/api/generated/endpoints/user/user";
+import { UpdateLanguageRequestLanguage } from "@/api/generated/models";
 import { useSettingsLanguageParam } from "@/app/[locale]/(main)/settings/_hooks/useSettingsLanguageParam";
-import { settingsProfileMock } from "@/app/[locale]/(main)/settings/_mocks/profile-mock";
+import { useSettingsProfileQuery } from "@/app/[locale]/(main)/settings/_queries/use-settings-profile";
+
+const LANGUAGE_REQUEST_MAP: Record<
+  SettingsLanguage,
+  (typeof UpdateLanguageRequestLanguage)[keyof typeof UpdateLanguageRequestLanguage]
+> = {
+  ko: UpdateLanguageRequestLanguage.KO,
+  en: UpdateLanguageRequestLanguage.EN,
+};
 
 const DEFAULT_TAG_KEYS: SettingsDefaultTagKey[] = [
   "assignment",
@@ -28,11 +38,16 @@ export const useSettingsProfile = () => {
   const { language, locale, setLanguage, commitLanguage } =
     useSettingsLanguageParam();
 
-  const [profile, setProfile] = useState<SettingsProfile>(settingsProfileMock);
+  const { data: profile } = useSettingsProfileQuery();
+  const [isCalendarConnected, setIsCalendarConnected] = useState(
+    profile.calendarConnected,
+  );
+  const { mutateAsync: updateLanguage } = useUpdateLanguage();
 
+  // TODO: 태그 목록 조회 API 연동 후 기본 태그 대신 실제 응답으로 교체
   const { watch, setValue, handleSubmit, reset, formState } =
     useForm<SettingsProfileFormValues>({
-      defaultValues: { tags: profile.tags },
+      defaultValues: { tags: DEFAULT_TAG_KEYS },
     });
   const tags = watch("tags");
 
@@ -47,20 +62,20 @@ export const useSettingsProfile = () => {
   });
 
   const handleConnectCalendar = () => {
-    if (profile.isCalendarConnected) {
+    if (isCalendarConnected) {
       // TODO: 실제 확인 모달로 교체
       const confirmed = window.confirm("구글 캘린더 연동을 해제하시겠습니까?");
       if (!confirmed) return;
 
       // TODO: API - 연동 토큰 파기
       console.log("구글 캘린더 연동 토큰을 파기합니다.");
-      setProfile((prev) => ({ ...prev, isCalendarConnected: false }));
+      setIsCalendarConnected(false);
       return;
     }
 
     // TODO: Google 계정 인증 및 캘린더 접근 권한 동의 팝업 호출
     console.log("Google Calendar 연동 인증 팝업을 호출합니다.");
-    setProfile((prev) => ({ ...prev, isCalendarConnected: true }));
+    setIsCalendarConnected(true);
   };
 
   const handleAddTag = () => {
@@ -86,10 +101,15 @@ export const useSettingsProfile = () => {
     console.log("[Login] 페이지로 이동합니다.");
   };
 
+  const isLanguageDirty = language !== locale;
+
   const handleSave = handleSubmit(async (values) => {
     try {
-      // TODO: API 연동
-      await new Promise((resolve) => setTimeout(resolve, 1000));
+      if (isLanguageDirty) {
+        await updateLanguage({
+          data: { language: LANGUAGE_REQUEST_MAP[language] },
+        });
+      }
       reset(values);
       commitLanguage();
     } catch {
@@ -98,13 +118,11 @@ export const useSettingsProfile = () => {
     }
   });
 
-  const isLanguageDirty = language !== locale;
-
   return {
     profileState: {
       name: profile.name,
-      googleEmail: profile.googleEmail,
-      isCalendarConnected: profile.isCalendarConnected,
+      googleEmail: profile.email,
+      isCalendarConnected,
       language,
       tags: tagItems,
       isSaveDisabled:
diff --git a/apps/timo-web/app/[locale]/(main)/settings/_mocks/profile-mock.ts b/apps/timo-web/app/[locale]/(main)/settings/_mocks/profile-mock.ts
deleted file mode 100644
index 9226811a..00000000
--- a/apps/timo-web/app/[locale]/(main)/settings/_mocks/profile-mock.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-import type { SettingsProfile } from "@/app/[locale]/(main)/settings/_types/profile-type";
-
-export const settingsProfileMock: SettingsProfile = {
-  name: "김도연",
-  googleEmail: "timogoogle@gmail.com",
-  isCalendarConnected: false,
-  tags: ["assignment", "work", "exercise", "dailyLife", "안녕"],
-};
diff --git a/apps/timo-web/app/[locale]/(main)/settings/_queries/use-settings-profile.ts b/apps/timo-web/app/[locale]/(main)/settings/_queries/use-settings-profile.ts
new file mode 100644
index 00000000..a556f1d8
--- /dev/null
+++ b/apps/timo-web/app/[locale]/(main)/settings/_queries/use-settings-profile.ts
@@ -0,0 +1,16 @@
+"use client";
+
+import { useSuspenseQuery } from "@tanstack/react-query";
+
+import {
+  getGetMyProfileQueryKey,
+  getMyProfile,
+} from "@/api/generated/endpoints/user/user";
+import { settingsProfileResponseSchema } from "@/app/[locale]/(main)/settings/_types/profile-type";
+
+export const useSettingsProfileQuery = () =>
+  useSuspenseQuery({
+    queryKey: getGetMyProfileQueryKey(),
+    queryFn: ({ signal }) => getMyProfile(undefined, signal),
+    select: ({ data }) => settingsProfileResponseSchema.parse(data),
+  });
diff --git a/apps/timo-web/app/[locale]/(main)/settings/_types/profile-type.ts b/apps/timo-web/app/[locale]/(main)/settings/_types/profile-type.ts
index 6d746036..2279fcf9 100644
--- a/apps/timo-web/app/[locale]/(main)/settings/_types/profile-type.ts
+++ b/apps/timo-web/app/[locale]/(main)/settings/_types/profile-type.ts
@@ -1,3 +1,5 @@
+import { z } from "zod";
+
 export type SettingsLanguage = "ko" | "en";
 
 export type SettingsDefaultTagKey =
@@ -6,12 +8,15 @@ export type SettingsDefaultTagKey =
   | "exercise"
   | "dailyLife";
 
-export interface SettingsProfile {
-  name: string;
-  googleEmail: string;
-  isCalendarConnected: boolean;
-  tags: string[];
-}
+export const settingsProfileResponseSchema = z.object({
+  name: z.string(),
+  email: z.string(),
+  calendarConnected: z.boolean(),
+});
+
+export type SettingsProfileResponse = z.infer<
+  typeof settingsProfileResponseSchema
+>;
 
 export interface SettingsProfileFormValues {
   tags: string[];
diff --git a/apps/timo-web/app/[locale]/oauth/callback/_containers/OauthCallbackContainer.tsx b/apps/timo-web/app/[locale]/oauth/callback/_containers/OauthCallbackContainer.tsx
index e642ca34..fe40cbe8 100644
--- a/apps/timo-web/app/[locale]/oauth/callback/_containers/OauthCallbackContainer.tsx
+++ b/apps/timo-web/app/[locale]/oauth/callback/_containers/OauthCallbackContainer.tsx
@@ -1,11 +1,9 @@
 "use client";
 
-import { useQueryClient } from "@tanstack/react-query";
 import { useSearchParams } from "next/navigation";
 import { useEffect, useRef } from "react";
 
 import { useToken } from "@/api/generated/endpoints/auth/auth";
-import { getGetMyProfileQueryKey } from "@/api/generated/endpoints/user/user";
 import { ROUTES } from "@/constants/routes";
 import { useRouter } from "@/i18n/navigation";
 import { useAuthStore } from "@/stores/auth/useAuthStore";
@@ -13,7 +11,6 @@ import { useAuthStore } from "@/stores/auth/useAuthStore";
 export const OauthCallbackContainer = () => {
   const code = useSearchParams().get("code");
   const router = useRouter();
-  const queryClient = useQueryClient();
   const setAccessToken = useAuthStore((state) => state.setAccessToken);
   const { mutate } = useToken();
   const hasRequested = useRef(false);
@@ -35,7 +32,6 @@ export const OauthCallbackContainer = () => {
             return;
           }
           setAccessToken(data.accessToken);
-          queryClient.setQueryData(getGetMyProfileQueryKey(), data.user);
           router.replace(data.isNewUser ? ROUTES.ONBOARDING : ROUTES.HOME);
         },
         onError: () => {
@@ -43,7 +39,7 @@ export const OauthCallbackContainer = () => {
         },
       },
     );
-  }, [code, mutate, queryClient, router, setAccessToken]);
+  }, [code, mutate, router, setAccessToken]);
 
   return null;
 };