diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index d9520d6a..53053f09 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.26.23",
+    "version": "2.26.24",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/handler/import.syzoj.ts b/packages/hydrooj/src/handler/import.syzoj.ts
index 37bec129..0c176ca1 100644
--- a/packages/hydrooj/src/handler/import.syzoj.ts
+++ b/packages/hydrooj/src/handler/import.syzoj.ts
@@ -18,6 +18,7 @@ import {
 } from '../service/server';
 import { isPid, parsePid } from '../lib/validator';
 import download from '../lib/download';
+import { buildContent } from '../lib/content';
 
 const RE_SYZOJ = /(https?):\/\/([^/]+)\/(problem|p)\/([0-9]+)\/?/i;
 const logger = new Logger('import.syzoj');
@@ -142,8 +143,9 @@ class ProblemImportSYZOJHandler extends Handler {
                 text: `${url}download/additional_file`,
             });
         }
+        const c = buildContent(content, 'markdown');
         const docId = await problem.add(
-            domainId, target, p.title, JSON.stringify(content), this.user._id, p.tags || [], hidden,
+            domainId, target, p.title, c, this.user._id, p.tags || [], hidden,
         );
         const r = download(`${url}testdata/download`);
         const file = path.resolve(os.tmpdir(), 'hydro', `import_${domainId}_${docId}.zip`);
diff --git a/packages/hydrooj/src/upgrade.ts b/packages/hydrooj/src/upgrade.ts
index 9098f9fc..89b83c9f 100644
--- a/packages/hydrooj/src/upgrade.ts
+++ b/packages/hydrooj/src/upgrade.ts
@@ -28,6 +28,7 @@ import { STATUS } from './model/builtin';
 import RecordModel from './model/record';
 import StorageModel from './model/storage';
 import { size } from './lib/misc';
+import { buildContent } from './lib/content';
 
 const logger = new Logger('upgrade');
 type UpgradeScript = void | (() => Promise<boolean | void>);
@@ -373,6 +374,25 @@ const scripts: UpgradeScript[] = [
         }
         return true;
     },
+    async function _28_29() {
+        const _FRESH_INSTALL_IGNORE = 1;
+        await iterateAllProblem(['content', 'html'], async (pdoc) => {
+            try {
+                const parsed = JSON.parse(pdoc.content);
+                if (parsed instanceof Array) {
+                    await problem.edit(pdoc.domainId, pdoc.docId, { content: buildContent(parsed, pdoc.html ? 'html' : 'markdown') });
+                    return;
+                }
+                const res = {};
+                for (const key in parsed) {
+                    if (typeof parsed[key] === 'string') res[key] = parsed[key];
+                    else res[key] = buildContent(parsed[key]);
+                }
+                await problem.edit(pdoc.domainId, pdoc.docId, { content: JSON.stringify(res) });
+            } catch { }
+        });
+        return true;
+    },
 ];
 
 export default scripts;
diff --git a/packages/import-qduoj/handler.ts b/packages/import-qduoj/handler.ts
index 5aa6e926..284ad323 100644
--- a/packages/import-qduoj/handler.ts
+++ b/packages/import-qduoj/handler.ts
@@ -9,6 +9,7 @@ import { BadRequestError, ValidationError } from 'hydrooj/dist/error';
 import { ProblemAdd } from 'hydrooj/dist/lib/ui';
 import problem from 'hydrooj/dist/model/problem';
 import { PERM } from 'hydrooj/dist/model/builtin';
+import { buildContent } from 'hydrooj/dist/lib/content';
 import type { ContentNode, ProblemConfig } from 'hydrooj';
 
 fs.ensureDirSync('/tmp/hydro/import-qduoj');
@@ -76,7 +77,7 @@ class ImportQduojHandler extends Handler {
                 if (+pdoc.display_id) pdoc.display_id = `P${pdoc.display_id}`;
                 const n = await problem.get(domainId, pdoc.display_id);
                 if (n) pdoc.display_id = null;
-                const pid = await problem.add(domainId, pdoc.display_id, pdoc.title, JSON.stringify(content), this.user._id, pdoc.tags);
+                const pid = await problem.add(domainId, pdoc.display_id, pdoc.title, buildContent(content, 'html'), this.user._id, pdoc.tags);
                 const config: ProblemConfig = {
                     time: `${pdoc.time_limit}ms`,
                     memory: `${pdoc.memory_limit}m`,
diff --git a/packages/import-qduoj/package.json b/packages/import-qduoj/package.json
index 9345e603..cb15b707 100644
--- a/packages/import-qduoj/package.json
+++ b/packages/import-qduoj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@hydrooj/import-qduoj",
-    "version": "1.1.8",
+    "version": "1.1.9",
     "description": "Import QDUOJ problem export",
     "main": "package.json",
     "repository": "https://github.com/hydro-dev/Hydro.git",