diff --git a/packages/hydrooj/src/handler/contest.ts b/packages/hydrooj/src/handler/contest.ts
index 8b3fb2e17..a2e448926 100644
--- a/packages/hydrooj/src/handler/contest.ts
+++ b/packages/hydrooj/src/handler/contest.ts
@@ -7,7 +7,6 @@ import {
 } from '../error';
 import { ProblemDoc, Tdoc, User } from '../interface';
 import paginate from '../lib/paginate';
-import { parseConfig } from '../lib/testdataConfig';
 import { PERM, PRIV } from '../model/builtin';
 import * as contest from '../model/contest';
 import * as system from '../model/system';
@@ -270,11 +269,6 @@ class ContestProblemHandler extends Handler {
             attended: this.attended,
             page_name: 'contest_detail_problem',
         };
-        try {
-            this.response.body.pdoc.config = await parseConfig(this.pdoc.config);
-        } catch (e) {
-            this.response.body.pdoc.config = `Cannot parse: ${e.message}`;
-        }
     }
 
     // eslint-disable-next-line
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index eec3087a5..01be9b319 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -24,7 +24,6 @@ import problem from '../model/problem';
 import record from '../model/record';
 import * as document from '../model/document';
 import paginate from '../lib/paginate';
-import { parseConfig } from '../lib/testdataConfig';
 
 const validatePenaltyRules = (input: string) => {
     const s = yaml.load(input);
@@ -144,11 +143,6 @@ class HomeworkDetailProblemHandler extends Handler {
             udoc: this.udoc,
             attended: this.attended,
         };
-        try {
-            this.response.body.pdoc.config = await parseConfig(this.pdoc.config);
-        } catch (e) {
-            this.response.body.pdoc.config = `Cannot parse: ${e.message}`;
-        }
     }
 
     @param('tid', Types.ObjectID)
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index dc5956d18..fce9340ba 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -13,7 +13,6 @@ import {
 import paginate from '../lib/paginate';
 import { isPid, parsePid as convertPid } from '../lib/validator';
 import difficultyAlgorithm from '../lib/difficulty';
-import { parseConfig } from '../lib/testdataConfig';
 import * as system from '../model/system';
 import problem from '../model/problem';
 import record from '../model/record';
@@ -203,12 +202,6 @@ export class ProblemDetailHandler extends ProblemHandler {
             ],
         };
         this.extraTitleContent = this.pdoc.title;
-        // Get time and memory limit
-        try {
-            this.response.body.pdoc.config = await parseConfig(this.pdoc.config);
-        } catch (e) {
-            this.response.body.pdoc.config = `Cannot parse: ${e.message}`;
-        }
     }
 
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
@@ -597,11 +590,20 @@ export class ProblemCreateHandler extends Handler {
 export class ProblemPrefixListHandler extends Handler {
     @param('prefix', Types.Name)
     async get(domainId: string, prefix: string) {
-        this.response.body = await problem.getPrefixList(domainId, prefix);
+        const pdocs = await problem.getPrefixList(domainId, prefix);
         if (!Number.isNaN(+prefix)) {
             const pdoc = await problem.get(domainId, +prefix, ['domainId', 'docId', 'pid', 'title']);
-            if (pdoc) this.response.body.unshift(pdoc);
+            if (pdoc) pdocs.unshift(pdoc);
         }
+        const search = global.Hydro.lib.problemSearch;
+        if (pdocs.length < 20) {
+            if (search) {
+                const result = await search(domainId, prefix, 20 - pdocs.length);
+                const docs = await problem.getMulti(domainId, { docId: { $in: result } }).toArray();
+                pdocs.push(...docs);
+            }
+        }
+        this.response.body = pdocs;
     }
 }
 
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index 8a07cfc88..5463a7913 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -207,7 +207,8 @@ declare module './model/problem' {
         /** @deprecated */
         category?: string[],
 
-        config: string,
+        /** string (errormsg) */
+        config: string | ProblemConfig,
     }
 }
 export type { ProblemDoc } from './model/problem';
diff --git a/packages/hydrooj/src/lib/testdataConfig.ts b/packages/hydrooj/src/lib/testdataConfig.ts
index c6f02b7a3..7fd4abd1d 100644
--- a/packages/hydrooj/src/lib/testdataConfig.ts
+++ b/packages/hydrooj/src/lib/testdataConfig.ts
@@ -9,21 +9,23 @@ interface ParseResult {
     timeMax: number;
     timeMin: number;
     langs?: string[];
+    type: string;
 }
 
 export async function parseConfig(config: string | ProblemConfig = {}) {
+    let cfg: ProblemConfig = {};
+    if (typeof config === 'string') {
+        // TODO should validate here?
+        cfg = await readYamlCases(load(config) as Record<string, any>);
+    } else if (typeof config === 'object') cfg = await readYamlCases(config);
     const result: ParseResult = {
         count: 0,
         memoryMin: Number.MAX_SAFE_INTEGER,
         memoryMax: 0,
         timeMin: Number.MAX_SAFE_INTEGER,
         timeMax: 0,
+        type: cfg.type || 'default',
     };
-    let cfg: ProblemConfig = {};
-    if (typeof config === 'string') {
-        // TODO should validate here?
-        cfg = await readYamlCases(load(config) as Record<string, any>);
-    } else if (typeof config === 'object') cfg = await readYamlCases(config);
     if (cfg.subtasks.length) {
         for (const subtask of cfg.subtasks) {
             result.memoryMax = Math.max(result.memoryMax, subtask.memory);
diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index d7fb9f7e2..563bc9fa3 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -12,6 +12,7 @@ import {
 } from '../typeutils';
 import { ProblemNotFoundError, ValidationError } from '../error';
 import * as bus from '../service/bus';
+import { parseConfig } from '../lib/testdataConfig';
 
 export interface ProblemDoc extends Document { }
 export type Field = keyof ProblemDoc;
@@ -79,9 +80,16 @@ export class ProblemModel {
         if (typeof pid !== 'number') {
             if (Number.isSafeInteger(parseInt(pid, 10))) pid = parseInt(pid, 10);
         }
-        return typeof pid === 'number'
+        const res = typeof pid === 'number'
             ? await document.get(domainId, document.TYPE_PROBLEM, pid, projection)
             : (await document.getMulti(domainId, document.TYPE_PROBLEM, { pid }).toArray())[0];
+        if (!res) return null;
+        try {
+            res.config = await parseConfig(res.config);
+        } catch (e) {
+            res.config = `Cannot parse: ${e.message}`;
+        }
+        return res;
     }
 
     static getMulti(domainId: string, query: FilterQuery<ProblemDoc>, projection = ProblemModel.PROJECTION_LIST) {
@@ -173,12 +181,12 @@ export class ProblemModel {
         await bus.emit('problem/delAdditionalFile', domainId, pid, names);
     }
 
-    static async random(domainId: string, query: FilterQuery<ProblemDoc>): Promise<string | null> {
+    static async random(domainId: string, query: FilterQuery<ProblemDoc>): Promise<string | number | null> {
         const cursor = document.getMulti(domainId, document.TYPE_PROBLEM, query);
         const pcount = await cursor.count();
         if (pcount) {
             const pdoc = await cursor.skip(Math.floor(Math.random() * pcount)).limit(1).toArray();
-            return pdoc[0].pid;
+            return pdoc[0].pid || pdoc[0].docId;
         } return null;
     }
 
@@ -194,6 +202,12 @@ export class ProblemModel {
         const pdocs = await document.getMulti(domainId, document.TYPE_PROBLEM, q)
             .project(buildProjection(projection)).toArray();
         for (const pdoc of pdocs) {
+            try {
+                // eslint-disable-next-line no-await-in-loop
+                pdoc.config = await parseConfig(pdoc.config);
+            } catch (e) {
+                pdoc.config = `Cannot parse: ${e.message}`;
+            }
             r[pdoc.docId] = pdoc;
             l[pdoc.pid] = pdoc;
         }
diff --git a/packages/ui-default/components/subjective-question/index.jsx b/packages/ui-default/components/subjective-question/index.jsx
index 314f94376..2087a228b 100644
--- a/packages/ui-default/components/subjective-question/index.jsx
+++ b/packages/ui-default/components/subjective-question/index.jsx
@@ -2,7 +2,7 @@ import React from 'react';
 import { sortBy } from 'lodash';
 import request from 'vj/utils/request';
 
-export default class MessagePadContainer extends React.PureComponent {
+export default class SubjectiveContainer extends React.PureComponent {
   constructor(args) {
     super(args);
     this.state = {};
diff --git a/packages/ui-default/pages/problem_detail.page.jsx b/packages/ui-default/pages/problem_detail.page.jsx
index af2d55320..c400fe0d8 100644
--- a/packages/ui-default/pages/problem_detail.page.jsx
+++ b/packages/ui-default/pages/problem_detail.page.jsx
@@ -103,22 +103,6 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
   let unmountReact = null;
   const extender = new ProblemPageExtender();
 
-  const copyProblemDialog = new ActionDialog({
-    $body: $('.dialog__body--send-to > div'),
-    onDispatch(action) {
-      const $target = copyProblemDialog.$dom.find('[name="target"]');
-      if (action === 'ok' && $target.val() === '') {
-        $target.focus();
-        return false;
-      }
-      return true;
-    },
-  });
-  copyProblemDialog.clear = function () {
-    this.$dom.find('[name="target"]').val('');
-    return this;
-  };
-
   async function handleClickDownloadProblem() {
     await downloadProblemSet([UiContext.problemNumId]);
   }
@@ -192,7 +176,8 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
 
   async function loadSubjective() {
     try {
-      const props = yaml.load(base64.decode(document.getElementsByClassName('section__body typo')[0].innerText));
+      if (UiContext.pdoc.config?.type !== 'subjective') return;
+      const props = yaml.load(document.getElementsByClassName('section__body typo')[0].innerText);
       if (!(props instanceof Array)) return;
       $('.outer-loader-container').show();
       const { default: Subjective } = await import('vj/components/subjective-question/index');