Kwon Eun-seong

as Bong Tae-min (young) (1 episode)

as Oh Beom (16 episodes)

as Shin Ja-in

as Lee Gil-yeong

as Hoon

as Kickboard Kid

as Ju-mong

as Oh Jae-seok's son

as Jung Won-ung (3 episodes)

as Young Mozasu (5 episodes)

as Lee Ji-wook (2 episodes)

as Gye Ha-jun (16 episodes)