diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 349c8250c..33c486a50 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.11.8",
+    "version": "3.11.9",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/upgrade.ts b/packages/hydrooj/src/upgrade.ts
index 8e5ec3f47..55490cb91 100644
--- a/packages/hydrooj/src/upgrade.ts
+++ b/packages/hydrooj/src/upgrade.ts
@@ -30,6 +30,7 @@ import db from './service/db';
 import storage from './service/storage';
 import { Progress } from './ui';
 import { streamToBuffer } from './utils';
+import welcome from './welcome';
 
 const logger = new Logger('upgrade');
 type UpgradeScript = void | (() => Promise<boolean | void>);
@@ -41,6 +42,7 @@ const scripts: UpgradeScript[] = [
     async function _1_2() {
         const ddoc = await domain.get('system');
         if (!ddoc) await domain.add('system', 1, 'Hydro', 'Welcome to Hydro!');
+        await welcome();
         // TODO discussion node?
         return true;
     },
diff --git a/packages/hydrooj/src/welcome.ts b/packages/hydrooj/src/welcome.ts
new file mode 100644
index 000000000..a9535deb5
--- /dev/null
+++ b/packages/hydrooj/src/welcome.ts
@@ -0,0 +1,95 @@
+import DomainModel from './model/domain';
+import ProblemModel from './model/problem';
+import RecordModel from './model/record';
+
+const bulletin = `\
+### 欢迎来到 Hydro ！  
+
+当你看到这行字时，说明 Hydro 的基础功能已经正常运行。  
+下一步您应该：
+
+- 在右上角注册一个账号。  
+- 回到刚刚的终端，使用 \`hydrooj cli user setSuperAdmin 2\` 将 UID 为 2 的用户设置为超级管理员。  
+- 使用 \`pm2 restart hydrooj\` 重启以使管理员更改立刻生效。  
+- 前往 “题库” 面板，查看创建的示例题目是否正常工作。  
+- 使用超级管理员账号登录，通读 [控制面板 -> 系统设置](/manage/setting) 页面，按需配置。  
+
+如果您需要可以直接导入的题目，可以 [加入 Hydro 用户群](https://jq.qq.com/?_wv=1027&k=pKYrk4yp) 或是 [从 Hydro 题库下载](https://hydro.ac/d/tk/p) 。  
+如果您需要题目配置指南，可以 [查看文档](https://hydro.js.org) 或是 [查看配置示例](https://hydro.ac/d/system_test/) 。
+
+这条消息可以在 [管理域 > 编辑域资料](/domain/edit) 页面修改。
+
+### Welcome to Hydro !  
+
+If you see this line, it means Hydro is running normally.  
+Next step you should:
+
+- Register a new account.  
+- Go back to the terminal, use \`hydrooj cli user setSuperAdmin 2\` to set user with UID 2 as super admin.  
+- Use \`pm2 restart hydrooj\` to make the change take effect.  
+- Go to “Problems” panel, check whether the example problem is working properly.  
+- Use super admin account to login, read the [Control panel -> System settings](/manage/setting) page, configure as needed.
+
+If you need to import a problem, you can join [Hydro user group](https://jq.qq.com/?_wv=1027&k=pKYrk4yp) 
+or download [Hydro problem library](https://hydro.ac/d/tk/p) .  
+If you need problem configuration guide, you can [view the document](https://hydro.js.org) or 
+[view examples](https://hydro.ac/d/system_test/) .
+
+This message can be modified in [Domain > Edit information](/domain/edit) page.
+`;
+
+const defaultProblem = JSON.stringify({
+    en: `\
+This is the example A+B problem.
+If you didn't see 'No testdata at current' message, it means file storage is working properly.
+
+Just write a program that reads two integers from standard input, and prints their sum to standard output.
+Feel free to delete this problem in 'Edit' panel if you don't need this.
+
+Click 'Enter Online Programming Mode' to open the built-in Hydro IDE.
+`,
+    zh: `\
+这是一道简单的 A+B 题目。
+如果您没有看到“当前没有测试数据”的消息，说明文件存储功能正常运行。
+
+编写一个程序，从标准输入读取两个整数，并将它们的和输出到标准输出。
+如果您不需要这道题目，可以在右侧“编辑”面板中删除它。
+
+点击右侧 “进入在线编程模式” 打开内置的 Hydro IDE。
+`,
+});
+
+const testdatas = {
+    'config.yaml': 'time: 1s\nmemory: 64m\n',
+    '1.in': '1 2\n',
+    '1.out': '3\n',
+    '2.in': '1 1\n',
+    '2.out': '2\n',
+};
+
+const std = `\
+// 这是由 Hydro 自动提交的测试代码，用于测试系统是否正常运行。
+// 如果这个提交返回了 Accepted ，则说明一切正常。
+// This is a submission by Hydro system, used to test if judge is working properly.
+// If this submission returns 'Accepted', it means everything is fine.
+
+#include<iostream>
+using namespace std;
+int main() {
+  int a, b;
+  cin >> a >> b;
+  cout << a + b << endl;
+  return 0;
+}
+`;
+
+export default async function apply() {
+    await DomainModel.edit('system', { bulletin });
+    const docId = await ProblemModel.add('system', 'P1000', 'A+B Problem', defaultProblem, 1, ['系统测试']);
+    // This might fail so we are doing it asynchronously.
+    Promise.all(
+        Object.keys(testdatas).map(
+            (i) => ProblemModel.addTestdata('system', docId, i, Buffer.from(testdatas[i])),
+        ),
+    ).then(() => RecordModel.add('system', docId, 1, 'cc', std, true));
+}
diff --git a/packages/ui-default/handler.ts b/packages/ui-default/handler.ts
index 9597abd3a..8ee3d7ef7 100644
--- a/packages/ui-default/handler.ts
+++ b/packages/ui-default/handler.ts
@@ -68,6 +68,7 @@ class WikiHelpHandler extends Handler {
     const languages = {};
     for (const key in LANGS) {
       if (LANGS[key].domain && !LANGS[key].domain.includes(domainId)) continue;
+      if (LANGS[key].hidden) continue;
       languages[`${LANGS[key].display}(${key})`] = LANGS[key].compile || LANGS[key].execute;
     }
     this.response.body = { languages };
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index fa357ef56..04aac7fab 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.34.32",
+  "version": "4.34.33",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",