diff --git a/app/controllers/competitions/competitions_controller.rb b/app/controllers/competitions/competitions_controller.rb
index 1a80dc7e6..31ed4367d 100644
--- a/app/controllers/competitions/competitions_controller.rb
+++ b/app/controllers/competitions/competitions_controller.rb
@@ -22,7 +22,7 @@ class Competitions::CompetitionsController < Competitions::BaseController
     @count = competitions.count
 
     competitions = competitions.order(published_at: :desc, online_time: :desc)
-    @competitions = paginate(competitions.includes(sponsor_schools: :school, current_stage_section: :competition_stage))
+    @competitions = paginate(competitions.includes(:competition_mode_setting, sponsor_schools: :school, current_stage_section: :competition_stage))
 
     ids = @competitions.map(&:id)
     @member_count_map = TeamMember.where(competition_id: ids).group(:competition_id).count
diff --git a/app/views/competitions/competitions/index.json.jbuilder b/app/views/competitions/competitions/index.json.jbuilder
index c01f0aa59..5027cdee0 100644
--- a/app/views/competitions/competitions/index.json.jbuilder
+++ b/app/views/competitions/competitions/index.json.jbuilder
@@ -5,7 +5,8 @@ json.competitions do
 
     json.competition_status competition.competition_status
     json.visits_count competition.visits
-    member_count = @member_count_map&.fetch(competition.id, 0) || competition.team_members.count
+    course = competition.competition_mode_setting.course if competition.mode == 2
+    member_count = course ? course.students.count : (@member_count_map&.fetch(competition.id, 0) || competition.team_members.count)
     json.member_count member_count.zero? ? 268 : member_count
 
     json.image url_to_avatar(competition)