Cho Dong-in

as Ki-chul

as Kim In-Seop (10 episodes)

as Jo Seung-hwa (10 episodes)

as Manager Lee (16 episodes)

as Jjageuli (1 episode)

as Jung Chan-ki (12 episodes)

as Pinwheel (3 episodes)

as Lee Taek-Kyu (32 episodes)

as Jin-sung

as Soi-dol

as Woo-hyeok

as Math Academy Teacher (2 episodes)

as Newcomer

as Min-su

as Shadow 2

as Sang-jun