diff --git a/src/shop/migrations/0005_shoppurchaselog_purchased_price.py b/src/shop/migrations/0005_shoppurchaselog_purchased_price.py
new file mode 100644
index 0000000..6968b7c
--- /dev/null
+++ b/src/shop/migrations/0005_shoppurchaselog_purchased_price.py
@@ -0,0 +1,36 @@
+# Generated by Django 3.2.12 on 2024-03-03 17:33
+# Edited manually by f2koi@plus on the same date
+
+from django.apps.registry import Apps
+from django.db import migrations, models
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+
+import shop.models as shop_models
+
+
+def forwards_func(apps: Apps, schema_editor: BaseDatabaseSchemaEditor):
+    ShopPurchaseLog: shop_models.ShopPurchaseLog = apps.get_model(
+        "shop", "ShopPurchaseLog"
+    )
+    for log in ShopPurchaseLog.objects.all():
+        log.purchased_price = log.item.price
+        log.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("shop", "0004_shopitem_author"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="shoppurchaselog",
+            name="purchased_price",
+            field=models.PositiveIntegerField(default=0),
+        ),
+        # https://docs.djangoproject.com/en/3.2/ref/migration-operations/#runpython
+        migrations.RunPython(
+            code=forwards_func, reverse_code=migrations.RunPython.noop
+        ),
+    ]
diff --git a/src/shop/models.py b/src/shop/models.py
index 04a212a..846521c 100644
--- a/src/shop/models.py
+++ b/src/shop/models.py
@@ -1,13 +1,12 @@
 import os
 
-from django.db import models
 from django.conf import settings
-from django.core.files.storage import FileSystemStorage
 from django.contrib.auth import get_user_model
+from django.core.files.storage import FileSystemStorage
+from django.db import models
 
 from problem.models import ProblemList
 
-
 User = get_user_model()
 
 
@@ -53,6 +52,7 @@ class ShopPurchaseLog(models.Model):
     succeed = models.BooleanField()
     retrieved = models.BooleanField()
     purchase_time = models.DateTimeField(auto_now_add=True)
+    purchased_price = models.PositiveIntegerField()
 
     class Meta:
         verbose_name = "상점 구매 로그"
diff --git a/src/shop/views.py b/src/shop/views.py
index 4d67ba1..116bca1 100644
--- a/src/shop/views.py
+++ b/src/shop/views.py
@@ -1,16 +1,17 @@
 from decimal import Decimal
-from random import SystemRandom
 from functools import reduce
+from random import SystemRandom
 
 from django import forms
-from django.db import IntegrityError
 from django.core.exceptions import ObjectDoesNotExist
+from django.db import IntegrityError
 from django.http import Http404, HttpResponseBadRequest, JsonResponse
 from django.shortcuts import render
 from django.views import View
 
-from website.views import PlusMemberCheck
 from problem.helpers.problem_info import get_problem_list_user_info
+from website.views import PlusMemberCheck
+
 from .models import Shop, ShopItem, ShopPurchaseLog
 
 
@@ -36,7 +37,10 @@ def get(self, request, pk=None):
             shop_items = shop.shop_items.filter(hidden=False)
             _, user_money = get_problem_list_user_info(shop.problem_list, request.user)
             purchase_log = list(
-                map(lambda x: x.item.price, ShopPurchaseLog.objects.filter(user=request.user, shop=shop))
+                map(
+                    lambda x: x.purchased_price,
+                    ShopPurchaseLog.objects.filter(user=request.user, shop=shop),
+                )
             )
             if purchase_log:
                 user_money -= reduce(lambda x, y: x + y, purchase_log)
@@ -75,11 +79,14 @@ def post(self, request, pk):
         required_luck = Decimal(100) - item_to_buy.chance
 
         _, user_money = get_problem_list_user_info(shop_point_source, request.user)
-        purchase_log = list(
-            map(lambda x: x.item.price, ShopPurchaseLog.objects.filter(user=request.user, shop=shop_to_visit))
+        purchased_prices = list(
+            map(
+                lambda x: x.purchased_price,
+                ShopPurchaseLog.objects.filter(user=request.user, shop=shop_to_visit),
+            )
         )
-        if purchase_log:
-            user_money -= reduce(lambda x, y: x + y, purchase_log)
+        if purchased_prices:
+            user_money -= reduce(lambda x, y: x + y, purchased_prices)
 
         enough_point = user_money >= required_point
         enough_luck = SystemRandom().uniform(0, 100) > required_luck
@@ -95,6 +102,7 @@ def post(self, request, pk):
                     item=item_to_buy,
                     succeed=succeed_purchase,
                     retrieved=False,
+                    purchased_price=required_point,
                 )
 
                 response["result"] = succeed_purchase