Jo Yeon-woo

as Dae-woo

as Gong Cheon-soo (120 episodes)

as Chang-woo (창우)

as Vice-principal (12 episodes)

as Kwon Joon-hyeok (50 episodes)

as Choi Dae-kyeong (2 episodes)

as Hwang Woo-jin (20 episodes)

as Jang Yoon-cheol (50 episodes)

as Director Choi Kyu Dong (20 episodes)

as Oh Hyeon-soo (40 episodes)

as Kim Sang-do (110 episodes)

as Kim Seon-woo (20 episodes)

as Choi Yong-bin (24 episodes)

as Kang Dong-joon (124 episodes)

as Seong-wook (27 episodes)

as Director Park (57 episodes)

as Yoo Joon-hee (106 episodes)

as Jeong Hoo-kyeom (77 episodes)

as Park PD

as Bae Hee-myeong (16 episodes)

as Ha Joon-ho (20 episodes)

as Yakuza (24 episodes)