diff --git a/packages/hydrooj/src/handler/contest.ts b/packages/hydrooj/src/handler/contest.ts
index d3840bc8c..fce6e3d0c 100644
--- a/packages/hydrooj/src/handler/contest.ts
+++ b/packages/hydrooj/src/handler/contest.ts
@@ -562,7 +562,10 @@ export class ContestManagementHandler extends ContestManagementBaseHandler {
             owner_udoc: await user.getById(domainId, this.tdoc.owner),
             pdict: await problem.getList(domainId, this.tdoc.pids, true, true, [...problem.PROJECTION_CONTEST_LIST, 'tag']),
             files: sortFiles(this.tdoc.files || []),
-            udict: await user.getListForRender(domainId, tcdocs.map((i) => i.owner), this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME)),
+            udict: await user.getListForRender(
+                domainId, tcdocs.map((i) => i.owner),
+                this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME) ? ['displayName'] : []
+            ),
             tcdocs,
             urlForFile: (filename: string) => this.url('contest_file_download', { tid, filename }),
         };
@@ -668,8 +671,10 @@ export class ContestUserHandler extends ContestManagementBaseHandler {
         for (const tsdoc of tsdocs) {
             tsdoc.endAt = (this.tdoc.duration && tsdoc.startAt) ? moment(tsdoc.startAt).add(this.tdoc.duration, 'hours').toDate() : null;
         }
-        const udict = await user.getListForRender(domainId,
-            [this.tdoc.owner, ...tsdocs.map((i) => i.uid)], this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME));
+        const udict = await user.getListForRender(
+            domainId, [this.tdoc.owner, ...tsdocs.map((i) => i.uid)],
+            this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME) ? ['displayName'] : []
+        );
         this.response.body = { tdoc: this.tdoc, tsdocs, udict };
         this.response.pjax = 'partials/contest_user.html';
         this.response.template = 'contest_user.html';
@@ -709,7 +714,7 @@ export class ContestBalloonHandler extends ContestManagementBaseHandler {
             owner_udoc: await user.getById(domainId, this.tdoc.owner),
             pdict: await problem.getList(domainId, this.tdoc.pids, true, true, problem.PROJECTION_CONTEST_LIST),
             bdocs,
-            udict: await user.getListForRender(domainId, uids, this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME)),
+            udict: await user.getListForRender(domainId, uids, this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME) ? ['displayName'] : []),
         };
         this.response.pjax = 'partials/contest_balloon.html';
         this.response.template = 'contest_balloon.html';
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index ca6bf2a0a..929521933 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -960,7 +960,7 @@ export class ProblemStatisticsHandler extends ProblemDetailHandler {
             'record',
         );
         const [udict, udoc] = await Promise.all([
-            user.getListForRender(domainId, rsdocs.map((i) => i.uid), this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME)),
+            user.getListForRender(domainId, rsdocs.map((i) => i.uid), this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME) ? ['displayName'] : []),
             user.getById(domainId, this.pdoc.owner),
         ]);
         this.response.template = 'problem_statistics.html';
diff --git a/packages/hydrooj/src/handler/training.ts b/packages/hydrooj/src/handler/training.ts
index 9442b5c5f..c616ca978 100644
--- a/packages/hydrooj/src/handler/training.ts
+++ b/packages/hydrooj/src/handler/training.ts
@@ -112,7 +112,7 @@ class TrainingDetailHandler extends Handler {
         const canViewHidden = this.user.hasPerm(PERM.PERM_VIEW_PROBLEM_HIDDEN) || this.user._id;
         const [udoc, udict, pdict, psdict, selfPsdict] = await Promise.all([
             user.getById(domainId, tdoc.owner),
-            user.getListForRender(domainId, enrollUsers, this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME)),
+            user.getListForRender(domainId, enrollUsers, this.user.hasPerm(PERM.PERM_VIEW_DISPLAYNAME) ? ['displayName'] : []),
             problem.getList(domainId, pids, canViewHidden, true),
             problem.getListStatus(domainId, uid, pids),
             shouldCompare ? problem.getListStatus(domainId, this.user._id, pids) : {},
diff --git a/packages/hydrooj/src/model/contest.ts b/packages/hydrooj/src/model/contest.ts
index c4abe746e..aaaa016b9 100644
--- a/packages/hydrooj/src/model/contest.ts
+++ b/packages/hydrooj/src/model/contest.ts
@@ -225,7 +225,7 @@ const acm = buildContestRule({
     async scoreboard(config, _, tdoc, pdict, cursor) {
         const rankedTsdocs = await db.ranked(cursor, (a, b) => a.score === b.score && a.time === b.time);
         const uids = rankedTsdocs.map(([, tsdoc]) => tsdoc.uid);
-        const udict = await user.getListForRender(tdoc.domainId, uids, config.showDisplayName);
+        const udict = await user.getListForRender(tdoc.domainId, uids, config.showDisplayName ? ['displayName'] : []);
         // Find first accept
         const first = {};
         const data = await document.collStatus.aggregate([
@@ -396,7 +396,7 @@ const oi = buildContestRule({
     async scoreboard(config, _, tdoc, pdict, cursor) {
         const rankedTsdocs = await db.ranked(cursor, (a, b) => a.score === b.score);
         const uids = rankedTsdocs.map(([, tsdoc]) => tsdoc.uid);
-        const udict = await user.getListForRender(tdoc.domainId, uids, config.showDisplayName);
+        const udict = await user.getListForRender(tdoc.domainId, uids, config.showDisplayName ? ['displayName'] : []);
         const psdict = {};
         const first = {};
         await Promise.all(tdoc.pids.map(async (pid) => {
@@ -746,7 +746,7 @@ const homework = buildContestRule({
     async scoreboard(config, _, tdoc, pdict, cursor) {
         const rankedTsdocs = await db.ranked(cursor, (a, b) => a.score === b.score);
         const uids = rankedTsdocs.map(([, tsdoc]) => tsdoc.uid);
-        const udict = await user.getListForRender(tdoc.domainId, uids, config.showDisplayName);
+        const udict = await user.getListForRender(tdoc.domainId, uids, config.showDisplayName ? ['displayName'] : []);
         const columns = await this.scoreboardHeader(config, _, tdoc, pdict);
         const rows: ScoreboardRow[] = [
             columns,
diff --git a/packages/hydrooj/src/model/user.ts b/packages/hydrooj/src/model/user.ts
index 8a4389bd1..de315081c 100644
--- a/packages/hydrooj/src/model/user.ts
+++ b/packages/hydrooj/src/model/user.ts
@@ -384,9 +384,12 @@ class UserModel {
         return projection ? coll.find(params).project<Udoc>(buildProjection(projection)) : coll.find(params);
     }
 
-    static async getListForRender(domainId: string, uids: number[], showDisplayName = true) {
+    static async getListForRender(domainId: string, uids: number[], extraFields?: string[]): Promise<BaseUserDict>;
+    static async getListForRender(domainId: string, uids: number[], arg: string[] | boolean) {
+        const fields = ['_id', 'uname', 'mail', 'avatar', 'school', 'studentId'].concat(arg instanceof Array ? arg : []);
+        const showDisplayName = arg instanceof Array ? fields.includes('displayName') : arg;
         const [udocs, vudocs, dudocs] = await Promise.all([
-            UserModel.getMulti({ _id: { $in: uids } }, ['_id', 'uname', 'mail', 'avatar', 'school', 'studentId']).toArray(),
+            UserModel.getMulti({ _id: { $in: uids } }, fields).toArray(),
             collV.find({ _id: { $in: uids } }).toArray(),
             domain.getDomainUserMulti(domainId, uids).project({ uid: 1, ...(showDisplayName ? { displayName: 1 } : {}) }).toArray(),
         ]);