Ju Jin-mo

as Son Guk-won (5 episodes)

as Yang Seon-chul (50 episodes)

as Lord Pagun (12 episodes)

as Director Bae Seok-dong

as (segment "There's no one here")

as Gyu-sang

as Baek Dal-ha (12 episodes)

as Principal

as Kim Jae-yeol (10 episodes)

as Mayor of Seoul (6 episodes)

as Lee Young-ho (8 episodes)

as Kim Deok-bae (14 episodes)

as Professor Oh

as CEO Hwang (16 episodes)

as Kim Gye-hee (6 episodes)

as Mr. Hong

as Man-gi

as Jjak-kwi

as Park Jin-Woo (16 episodes)

as So-pal

as Jo Suk's Father (20 episodes)

as Song Kyeong-soo

as Director Jang (32 episodes)

as Inspector Yang

as Park Joong-Ho (64 episodes)