diff --git a/packages/hydrooj/src/handler/discussion.ts b/packages/hydrooj/src/handler/discussion.ts
index ad140c8a..213ecbfd 100644
--- a/packages/hydrooj/src/handler/discussion.ts
+++ b/packages/hydrooj/src/handler/discussion.ts
@@ -173,6 +173,7 @@ class DiscussionDetailHandler extends DiscussionHandler {
             system.get('pagination.reply'),
         );
         const uids = [
+            ...this.vnode.owner ? [this.vnode.owner] : [],
             this.ddoc.owner,
             ...drdocs.map((drdoc) => drdoc.owner),
         ];
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 0d49eb20..ad724b5f 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -376,6 +376,7 @@ export class ProblemDetailHandler extends ContestDetailBaseHandler {
             solutionCount: scnt,
             discussionCount: dcnt,
             tdoc: this.tdoc,
+            owner_udoc: (tid && this.tdoc.owner !== this.pdoc.owner) ? await user.getById(domainId, this.tdoc.owner) : null,
         };
         if (this.tdoc && this.tsdoc) {
             const fields = ['attend', 'startAt'];
diff --git a/packages/ui-default/templates/contest_user.html b/packages/ui-default/templates/contest_user.html
index 5641730d..a538adbc 100644
--- a/packages/ui-default/templates/contest_user.html
+++ b/packages/ui-default/templates/contest_user.html
@@ -41,7 +41,7 @@
   </div>
   <div class="medium-3 columns">
   {% set owner_udoc = udict[tdoc.owner] %}
-  {% include "partials/contest_sidebar.html" %}
+  {% include "partials/contest_sidebar_management.html" %}
   </div>
 </div>
 {% endblock %}
diff --git a/packages/ui-default/templates/partials/problem_sidebar.html b/packages/ui-default/templates/partials/problem_sidebar.html
index 918a6e52..c3d8fc2b 100644
--- a/packages/ui-default/templates/partials/problem_sidebar.html
+++ b/packages/ui-default/templates/partials/problem_sidebar.html
@@ -1,7 +1,7 @@
+{% if not owner_udoc %}
+  {% set owner_udoc = udoc %}
+{% endif %}
 {% if tdoc %}
-  {% if not owner_udoc %}
-    {% set owner_udoc = udoc %}
-  {% endif %}
   {% if tdoc.rule == 'homework' %}
     {% include "partials/problem_sidebar_homework.html" %}
     {% include "partials/homework_sidebar.html" %}
diff --git a/packages/ui-default/templates/problem_config.html b/packages/ui-default/templates/problem_config.html
index 611df399..dff8e7ba 100644
--- a/packages/ui-default/templates/problem_config.html
+++ b/packages/ui-default/templates/problem_config.html
@@ -32,7 +32,6 @@
       {% set filetype = "testdata" %}
       {% include "partials/problem_files.html" %}
     </div>
-    {% set owner_udoc = udoc %}
     {% include "partials/problem_sidebar.html" %}
   </div>
 </div>
diff --git a/packages/ui-default/templates/problem_detail.html b/packages/ui-default/templates/problem_detail.html
index 08a81d90..2e9b93b3 100644
--- a/packages/ui-default/templates/problem_detail.html
+++ b/packages/ui-default/templates/problem_detail.html
@@ -111,7 +111,6 @@
     </div>
   </div>
   <div class="medium-3 columns"><div data-sticky="large">
-    {% set owner_udoc = udoc %}
     {% include "partials/problem_sidebar.html" %}
   </div></div>
 </div>
diff --git a/packages/ui-default/templates/problem_edit.html b/packages/ui-default/templates/problem_edit.html
index 8db72bc3..43f95bad 100644
--- a/packages/ui-default/templates/problem_edit.html
+++ b/packages/ui-default/templates/problem_edit.html
@@ -110,7 +110,6 @@
         {% set filetype = "additional_file" %}
         {% include "partials/problem_files.html" %}
       </div>
-      {% set owner_udoc = udoc %}
       {% include "partials/problem_sidebar.html" %}
     {% else %}
       {% include 'components/md_hint.html' %}
diff --git a/packages/ui-default/templates/problem_files.html b/packages/ui-default/templates/problem_files.html
index ac01788b..c6c4b287 100644
--- a/packages/ui-default/templates/problem_files.html
+++ b/packages/ui-default/templates/problem_files.html
@@ -48,7 +48,6 @@
     </div>
   </div>
   <div class="medium-3 columns">
-    {% set owner_udoc = udoc %}
     {% include "partials/problem_sidebar.html" %}
   </div>
 </div>
diff --git a/packages/ui-default/templates/problem_hack.html b/packages/ui-default/templates/problem_hack.html
index 72c3f2bb..65054de9 100644
--- a/packages/ui-default/templates/problem_hack.html
+++ b/packages/ui-default/templates/problem_hack.html
@@ -24,7 +24,6 @@
     </div>
   </div>
   <div class="medium-3 columns">
-    {% set owner_udoc = udoc %}
     {% include "partials/problem_sidebar.html" %}
   </div>
 </div>
diff --git a/packages/ui-default/templates/problem_submit.html b/packages/ui-default/templates/problem_submit.html
index b160cdaa..2da9691d 100644
--- a/packages/ui-default/templates/problem_submit.html
+++ b/packages/ui-default/templates/problem_submit.html
@@ -33,7 +33,6 @@
     </div>
   </div>
   <div class="medium-3 columns">
-    {% set owner_udoc = udoc %}
     {% include "partials/problem_sidebar.html" %}
   </div>
 </div>