diff --git a/database/models.py b/database/models.py
index 9d4dec3..781dfd2 100644
--- a/database/models.py
+++ b/database/models.py
@@ -32,8 +32,9 @@ class User(TimestampModel, table=True):
     __tablename__ = "user"
 
     user_key: int = Field(primary_key=True)
-    email: str
-    nickname: str
+    id: int
+    nick_name: Optional[str] = None
+    profile_url: Optional[str] = None
 
 
 class Category(TimestampModel, table=True):
diff --git a/src/auth/auth.py b/src/auth/auth.py
index 9df68f0..702cc66 100644
--- a/src/auth/auth.py
+++ b/src/auth/auth.py
@@ -83,13 +83,12 @@ async def get_current_user(
     user_service = UserService(user_repository=UserRepository(session=session))
     try:
         payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
-        user_email: str = payload.get("sub")
-        if user_email is None:
+        user_key: int = payload.get("sub")
+        if user_key is None:
             raise credentials_exception
-        token_data = TokenEmail(user_email=user_email)
     except JWTError:
         raise credentials_exception
-    user = await user_service.get_user_by_email(email=user_email)
+    user = await user_service.get_user_by_user_key(user_key=int(user_key))
     if user is None:
         raise credentials_exception
     return user
@@ -101,12 +100,12 @@ async def get_current_active_user(
     return current_user
 
 
-async def generate_access_token(email: str):
+async def generate_access_token(user_key: int):
     """
     :return: 액세스 토큰을 만들어서, 반환한다.
     """
     access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
     access_token = create_access_token(
-        data={"sub": email}, expires_delta=access_token_expires
+        data={"sub": str(user_key)}, expires_delta=access_token_expires
     )
     return {"access_token": access_token, "token_type": "bearer"}
diff --git a/src/router/auth.py b/src/router/auth.py
index 752d8f1..c52dad2 100644
--- a/src/router/auth.py
+++ b/src/router/auth.py
@@ -1,9 +1,12 @@
-import requests
+from typing import Optional
+
 from fastapi import APIRouter, Depends
+from jose import jwt
+from pydantic import BaseModel
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from database.connection import get_session
-from src.auth.auth import generate_access_token
+from src.auth.auth import generate_access_token, SECRET_KEY, ALGORITHM
 from src.user.application.user import UserService
 from src.user.repository.users import UserRepository
 
@@ -12,63 +15,25 @@
 )
 
 
-@auth_router.get("/login/kakao")
-async def kakao_login(code: str, session: AsyncSession = Depends(get_session)):
-    """
-    https://kauth.kakao.com/oauth/authorize?client_id=d12d5a49f7a6ae9c1fb44443ec2f18fb&redirect_uri=http://localhost:8000/api/v1/auth/login/kakao&response_type=code
-    위의 URL로 접속한 다음에, 이루어지는 로직
-    """
-    # TODO: 해당 함수 리펙토링 하기
-    """
-    문제점이라고 생각되는 것들
-    1. 페이로드가 좀 더럽다?
-    2. 함수 하나가 너무 길다.
-    3.
-    """
-    # STEP 1. 토큰 발급
-    url = "https://kauth.kakao.com/oauth/token"
-    kakao_data = {
-        "grant_type": "authorization_code",
-        "client_id": "d12d5a49f7a6ae9c1fb44443ec2f18fb",
-        "redirect_uri": "http://localhost:8000/api/v1/auth/login/kakao",
-        "code": code,
-        "client_secret": "Xh89YsF1r4D3BnrzcM7hHSluF7TrkIxz",
-    }
-
-    headers = {"Content-Type": "application/x-www-form-urlencoded;charset=utf-8"}
-    response = requests.post(url, data=kakao_data, headers=headers)
-    access_token_dict = response.json()
-    access_token = access_token_dict["access_token"]
+class LoginRequest(BaseModel):
+    id: int
+    nickname: str
+    profile_url: Optional[str] = None
 
-    # STEP 2. 액세스 토큰으로 부터 유저 정보 조회
-    headers = {
-        "Content-Type": "Content-type: application/x-www-form-urlencoded;charset=utf-8",
-        "Authorization": f"Bearer {access_token}",
-    }
-    data = {
-        "property_keys": '["kakao_account.email", "kakao_account.profile, "kakao_account.name"]'
-    }
 
-    url = "https://kapi.kakao.com/v2/user/me"
-    response = requests.post(url, headers=headers, data=data)
-    response_dict = response.json().get("kakao_account")
-
-    email = response_dict.get("email")
-    nickname = response_dict.get("profile").get("nickname")
-    response_dict.get("profile").get("thumbnail_image_url")
-
-    # STEP 3. 이메일을 조회한다.
-    # 유저 이메일을 조회했을 때 회원이 존재한다면, 회원가입 아니면 액세스 토큰을 만들어서 반환
+@auth_router.post("/login/kakao")
+async def kakao_login(req: LoginRequest, session: AsyncSession = Depends(get_session)):
+    """
+    로그인 정보로 로그인 한다.
+    """
     user_service = UserService(user_repository=UserRepository(session=session))
-    user = await user_service.get_user_by_email(email=email)
-    # 유저가 존재하면, 액세스 토큰을 만들어서 전달한다.
-    # TODO: 3. 여기 로직을 개선할 수 있을 것 같다. 4. 토큰값을 리턴해야하는데 현재 그냥 "test" 문자열 리턴하고 있음
-
-    if user:
-        return await generate_access_token(email=email)
-    else:
-        # 유저가 존재하지 않으면 회원 가입 및 생성 및 토큰을 전달한다.
-        user = await user_service.create_user(nickname=nickname, email=email)
-        response = await generate_access_token(email=email)
-        await session.commit()
-        return "test"
+    user = await user_service.get_user_by_id(id=req.id)
+    if not user:
+        user = await user_service.create_user(
+            id=req.id, nickname=req.nickname, profile_url=req.profile_url
+        )
+    await session.commit()
+    token = await generate_access_token(user_key=user.user_key)
+    payload = jwt.decode(token["access_token"], SECRET_KEY, algorithms=[ALGORITHM])
+
+    return {"access_token": await generate_access_token(user_key=user.user_key)}
diff --git a/src/user/application/user.py b/src/user/application/user.py
index eb2077c..80347cc 100644
--- a/src/user/application/user.py
+++ b/src/user/application/user.py
@@ -1,4 +1,3 @@
-from database.models import User
 from src.user.repository.users import UserRepository
 
 
@@ -6,14 +5,22 @@ class UserService:
     def __init__(self, user_repository: UserRepository):
         self.user_repository = user_repository
 
-    async def create_user(self, nickname: str, email: str):
+    async def create_user(self, id: int, nickname: str, profile_url: str):
         """
         유저를 생성한다.
         """
-        return await self.user_repository.create_user(nickname=nickname, email=email)
+        return await self.user_repository.create_user(
+            id=id, nickname=nickname, profile_url=profile_url
+        )
 
-    async def get_user_by_email(self, email: str) -> User:
+    async def get_user_by_id(self, id: int):
         """
-        유저를 유저 이메일로 조회한다.
+        유저를 유저 아이디로 조회한다.
         """
-        return await self.user_repository.get_user_by_email(email=email)
+        return await self.user_repository.get_user_by_id(id=id)
+
+    async def get_user_by_user_key(self, user_key: int):
+        """
+        유저를 유저 키로 조회한다.
+        """
+        return await self.user_repository.get_user_by_user_key(user_key=user_key)
diff --git a/src/user/repository/users.py b/src/user/repository/users.py
index f2a70ec..94bbd40 100644
--- a/src/user/repository/users.py
+++ b/src/user/repository/users.py
@@ -9,25 +9,44 @@ class UserRepository:
     def __init__(self, session):
         self.session = session
 
-    async def create_user(self, nickname, email):
+    async def create_user(self, id, nickname, profile_url):
         """
         이메일로 유저를 생성한다.
         """
         user = User(
+            id=id,
             nickname=nickname,
-            email=email,
-            created_at=datetime.now(),
-            updated_at=datetime.now(),
-            deleted=False,
+            profile_url=profile_url,
+            created_at=datetime.utcnow(),
+            updated_at=datetime.utcnow(),
         )
         self.session.add(user)
+        await self.session.flush()
         return user
 
-    async def get_user_by_email(self, email):
+    async def get_user_by_id(self, id: int):
         """
-        이메일에 일치하는 유저를 반환한다.
+        아이디와 일치하는 유저를 반환한다.
         """
-        statement = select(User).where(User.email == email)
+        statement = select(User).where(User.id == id)
+        result = await self.session.execute(statement)
+        user = result.scalar_one_or_none()
+        return user
+
+    async def get_user_by_id(self, id: int):
+        """
+        아이디와 일치하는 유저를 반환한다.
+        """
+        statement = select(User).where(User.id == id)
+        result = await self.session.execute(statement)
+        user = result.scalar_one_or_none()
+        return user
+
+    async def get_user_by_user_key(self, user_key: int):
+        """
+        유저를 유저 키로 조회한다.
+        """
+        statement = select(User).where(User.user_key == user_key)
         result = await self.session.execute(statement)
         user = result.scalar_one_or_none()
         return user