diff --git a/apps/api/plane/app/views/view/base.py b/apps/api/plane/app/views/view/base.py
index 82ad652a37..d17ad68b7b 100644
--- a/apps/api/plane/app/views/view/base.py
+++ b/apps/api/plane/app/views/view/base.py
@@ -289,12 +289,18 @@ class WorkspaceViewIssuesViewSet(BaseViewSet):
     )
     def list(self, request, slug):
         filters = issue_filters(request.query_params, "GET")
+
         order_by_param = request.GET.get("order_by", "-created_at")
 
         # Validate the order_by_param
         order_by_param = self._validate_order_by_field(order_by_param)
 
-        issue_queryset = self.get_queryset().filter(**filters)
+        if request.query_params.get("sub_issue", None) == "false":
+            issue_queryset = self.get_queryset().filter(
+                Q(parent__isnull=True) | (Q(parent__type__is_epic=True))
+            )
+        else:
+            issue_queryset = self.get_queryset().filter(**filters)
 
         # Get common project permission filters
         permission_filters = self._get_project_permission_filters()