diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 49c3b87c..70385dcd 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -24,7 +24,9 @@ env:
 jobs:
   deploy:
     name: Run Tests
-    runs-on: ubuntu-20.04
+    # runs-on: ubuntu-20.04
+    runs-on: [self-hosted]
+
     steps:
       - name: Checkout
         uses: actions/checkout@v2
diff --git a/apps/core/admin.py b/apps/core/admin.py
index 16f680d3..d6d29883 100644
--- a/apps/core/admin.py
+++ b/apps/core/admin.py
@@ -32,9 +32,9 @@ def lookups(self, request, model_admin):
 
     def queryset(self, request, queryset):
         if self.value() == "hidden":
-            return queryset.exclude(hidden_at=MIN_TIME)
+            return queryset.exclude(hidden_at=None)
         if self.value() == "not_hidden":
-            return queryset.filter(hidden_at=MIN_TIME)
+            return queryset.filter(hidden_at=None)
 
 
 @admin.register(Board)
@@ -81,6 +81,7 @@ class FAQAdmin(MetaDataModelAdmin):
 
 @admin.register(Article)
 class ArticleAdmin(MetaDataModelAdmin):
+    actions = ("restore_hidden_articles",)
     list_filter = (
         "name_type",
         "is_content_sexual",
@@ -91,28 +92,63 @@ class ArticleAdmin(MetaDataModelAdmin):
     )
     list_display = (
         "title",
+        "parent_board",
+        "user_nickname",
+        "user_email",
         "hit_count",
-        "positive_vote_count",
-        "negative_vote_count",
-        "name_type",
-        "is_content_sexual",
-        "is_content_social",
         "report_count",
+        "created_at",
         "hidden_at",
     )
-    raw_id_fields = (
+    raw_id_fields = ("created_by",)
+    search_fields = (
+        "title",
+        "content",
+        "hidden_at",
+        "created_by__email",
+    )
+    fields = (
+        "title",
+        "content",
         "created_by",
-        "parent_topic",
         "parent_board",
+        "parent_topic",
+        "name_type",
+        ("is_content_sexual", "is_content_social"),
+        ("hit_count", "migrated_hit_count"),
+        ("positive_vote_count", "migrated_positive_vote_count"),
+        ("negative_vote_count", "migrated_negative_vote_count"),
+        ("comment_count", "report_count"),
+        "attachments",
+        "content_updated_at",
+        "commented_at",
+        "url",
+        "hidden_at",
     )
-    search_fields = ("title", "content", "hidden_at", "created_by__email")
-    actions = ("restore_hidden_articles",)
+    readonly_fields = (
+        "hit_count",
+        "positive_vote_count",
+        "negative_vote_count",
+        "comment_count",
+        "report_count",
+        "commented_at",
+        "content_updated_at",
+    )
+    filter_horizontal = ("attachments",)
 
     @admin.action(description=gettext("Restore hidden articles"))
     def restore_hidden_articles(self, request, queryset):
-        rows_updated = queryset.update(hidden_at=MIN_TIME)
+        rows_updated = queryset.update(hidden_at=None)
         self.message_user(request, f"{rows_updated}개의 게시물(들)이 성공적으로 복구되었습니다.")
 
+    @admin.display(description="닉네임")
+    def user_nickname(self, obj: Article):
+        return obj.created_by_nickname
+
+    @admin.display(description="이메일")
+    def user_email(self, obj: Article):
+        return obj.created_by.email
+
 
 @admin.register(Comment)
 class CommentAdmin(MetaDataModelAdmin):
@@ -138,7 +174,7 @@ class CommentAdmin(MetaDataModelAdmin):
 
     @admin.action(description=gettext("Restore hidden comments"))
     def restore_hidden_comments(self, request, queryset):
-        rows_updated = queryset.update(hidden_at=MIN_TIME)
+        rows_updated = queryset.update(hidden_at=None)
         self.message_user(request, f"{rows_updated}개의 댓글(들)이 성공적으로 복구되었습니다.")
 
 
diff --git a/apps/core/migrations/0044_alter_article_url.py b/apps/core/migrations/0044_alter_article_url.py
new file mode 100644
index 00000000..95f642eb
--- /dev/null
+++ b/apps/core/migrations/0044_alter_article_url.py
@@ -0,0 +1,20 @@
+# Generated by Django 3.2.16 on 2023-03-29 20:08
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0043_board_comment_access_mask"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="article",
+            name="url",
+            field=models.URLField(
+                blank=True, default=None, null=True, verbose_name="포탈 링크"
+            ),
+        ),
+    ]
diff --git a/apps/core/migrations/0045_alter_hidden_at_to_nullable.py b/apps/core/migrations/0045_alter_hidden_at_to_nullable.py
new file mode 100644
index 00000000..f2dad329
--- /dev/null
+++ b/apps/core/migrations/0045_alter_hidden_at_to_nullable.py
@@ -0,0 +1,27 @@
+# Generated by Django 3.2.16 on 2023-03-30 22:56
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0044_alter_article_url"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="article",
+            name="hidden_at",
+            field=models.DateTimeField(
+                blank=True, default=None, null=True, verbose_name="숨김 시간"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="comment",
+            name="hidden_at",
+            field=models.DateTimeField(
+                blank=True, default=None, null=True, verbose_name="숨김 시간"
+            ),
+        ),
+    ]
diff --git a/apps/core/migrations/0046_update_hidden_at_min_time_to_null.py b/apps/core/migrations/0046_update_hidden_at_min_time_to_null.py
new file mode 100644
index 00000000..0c2f294d
--- /dev/null
+++ b/apps/core/migrations/0046_update_hidden_at_min_time_to_null.py
@@ -0,0 +1,24 @@
+# Generated by yuwol
+
+from django.db import migrations
+
+from ara.settings import MIN_TIME
+
+
+def update_hidden_at(apps, schema_editor):
+    Article = apps.get_model("core", "Article")
+    Article.objects.filter(hidden_at=MIN_TIME).update(hidden_at=None)
+
+    Comment = apps.get_model("core", "Comment")
+    Comment.objects.filter(hidden_at=MIN_TIME).update(hidden_at=None)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0045_alter_hidden_at_to_nullable"),
+    ]
+
+    operations = [
+        migrations.RunPython(update_hidden_at, atomic=True),
+    ]
diff --git a/apps/core/models/article.py b/apps/core/models/article.py
index bf7fb7d1..c80b4de3 100644
--- a/apps/core/models/article.py
+++ b/apps/core/models/article.py
@@ -138,11 +138,12 @@ class Meta(MetaDataModel.Meta):
         verbose_name="마지막 댓글 시간",
     )
 
-    url = models.TextField(
+    url = models.URLField(
         null=True,
+        max_length=200,
         blank=True,
         default=None,
-        verbose_name="링크",
+        verbose_name="포탈 링크",
     )
 
     content_updated_at = models.DateTimeField(
@@ -152,7 +153,9 @@ class Meta(MetaDataModel.Meta):
     )
 
     hidden_at = models.DateTimeField(
-        default=MIN_TIME,
+        null=True,
+        blank=True,
+        default=None,
         verbose_name="숨김 시간",
     )
 
@@ -247,7 +250,7 @@ def update_vote_status(self):
         self.save()
 
     def is_hidden_by_reported(self) -> bool:
-        return self.hidden_at != MIN_TIME
+        return self.hidden_at is not None
 
     @property
     def created_by_nickname(self):
diff --git a/apps/core/models/attachment.py b/apps/core/models/attachment.py
index 528108a9..63f938a6 100644
--- a/apps/core/models/attachment.py
+++ b/apps/core/models/attachment.py
@@ -24,3 +24,6 @@ class Meta(MetaDataModel.Meta):
         max_length=128,
         verbose_name="타입",
     )
+
+    def __str__(self) -> str:
+        return self.file.name
diff --git a/apps/core/models/comment.py b/apps/core/models/comment.py
index c6f022a3..e08cbc78 100644
--- a/apps/core/models/comment.py
+++ b/apps/core/models/comment.py
@@ -94,7 +94,9 @@ class Meta(MetaDataModel.Meta):
         verbose_name="댓글",
     )
     hidden_at = models.DateTimeField(
-        default=MIN_TIME,
+        null=True,
+        blank=True,
+        default=None,
         verbose_name="숨김 시간",
     )
 
@@ -147,7 +149,7 @@ def get_parent_article(self):
         return self.parent_comment.parent_article
 
     def is_hidden_by_reported(self) -> bool:
-        return self.hidden_at != MIN_TIME
+        return self.hidden_at is not None
 
     def is_deleted(self) -> bool:
         return self.deleted_at != MIN_TIME
diff --git a/ara/firebase.py b/ara/firebase.py
index 055c1ade..851baf39 100644
--- a/ara/firebase.py
+++ b/ara/firebase.py
@@ -4,6 +4,9 @@
 
 
 def fcm_notify_comment(user, title, body, open_url):
+    ################## Disable FCM ####################
+    return
+
     targets = FCMToken.objects.filter(user=user)
     for i in targets:
         try:
@@ -16,6 +19,9 @@ def fcm_notify_comment(user, title, body, open_url):
 def fcm_simple(FCM_token, title="Title", body="Body", open_url="/"):
     # This registration token comes from the client FCM SDKs.
     # See documentation on defining a message payload.
+
+    ################## Disable FCM ####################
+    return
     message = messaging.Message(
         notification=messaging.Notification(
             title=title,