diff --git a/API/MongoDB.py b/API/MongoDB.py
new file mode 100644
index 0000000..261334b
--- /dev/null
+++ b/API/MongoDB.py
@@ -0,0 +1,50 @@
+from dataclasses import dataclass
+
+
+@dataclass
+class Councilor:
+    sdName: str
+    sggName: str
+    wiwName: str
+    name: str
+    jdName: str
+    gender: str
+    birthday: str
+    age: int
+    jobId: int
+    job: str
+    eduId: int
+    edu: str
+
+    @classmethod
+    def from_dict(cls, data: dict):
+        return cls(
+            sdName=data.get("sdName"),
+            sggName=data.get("sggName"),
+            wiwName=data.get("wiwName"),
+            name=data.get("name"),
+            jdName=data.get("jdName"),
+            gender=data.get("gender"),
+            birthday=data.get("birthday"),
+            age=int(data.get("age")),
+            jobId=int(data.get("jobId")),
+            job=data.get("job"),
+            eduId=int(data.get("eduId")),
+            edu=data.get("edu"),
+        )
+
+    def to_dict(self):
+        return {
+            "sdName": self.sdName,
+            "sggName": self.sggName,
+            "wiwName": self.wiwName,
+            "name": self.name,
+            "jdName": self.jdName,
+            "gender": self.gender,
+            "birthday": self.birthday,
+            "age": self.age,
+            "jobId": self.jobId,
+            "job": self.job,
+            "eduId": self.eduId,
+            "edu": self.edu,
+        }
diff --git a/API/candidate.py b/API/candidate.py
index 7ddda3b..b61b2c8 100644
--- a/API/candidate.py
+++ b/API/candidate.py
@@ -3,6 +3,7 @@
 import os, requests, sys
 import xml.etree.ElementTree as ET
 from typing import List
+import argparse
 
 from configurations.secrets import OpenDataPortalSecrets
 from .utils import save_to_excel, getLocalMetroMap
diff --git a/API/utils.py b/API/utils.py
index e6d214b..5391a8a 100644
--- a/API/utils.py
+++ b/API/utils.py
@@ -40,17 +40,20 @@ def save_to_mongo(data: List[dict], sgTypecode: str) -> None:
     # TODO: Support other types of councils
     if sgTypecode == "6":
         for entry in data:
-            district_id = local_metro_map[(entry["sdName"], entry["wiwName"])][
-                "local_id"
-            ]
-
+            if not (entry["sdName"], entry["wiwName"]) in local_metro_map:
+                print(
+                    f"Warning: '{entry['sdName']} {entry['wiwName']}'에 해당하는 지역 ID가 존재하지 않습니다."
+                )
+                continue
+            district_id = local_metro_map[(entry["sdName"], entry["wiwName"])]
             if district_id:
                 main_collection.update_one(
                     {
                         "name": entry["name"],
-                        "localId": district_id,
+                        "local_id": district_id["local_id"],
+                        "metro_id": district_id["metro_id"],
                     },
-                    {"$push": Councilor.from_dict(entry)},
+                    {"$set": Councilor.from_dict(entry).to_dict()},
                     upsert=True,
                 )
             else:
diff --git a/API/votecode.py b/API/votecode.py
index 374e761..236c18d 100644
--- a/API/votecode.py
+++ b/API/votecode.py
@@ -27,7 +27,6 @@
 xml_data = response.content.decode("utf-8")
 # Parse the XML data
 root = ET.fromstring(xml_data)
-
 # Find all elements where sgTypecode is equal to INPUT and extract their sgId values
 sgIds = set()
 for code in input("Input the number of sgTypecode: ").split(","):