Lee Ho-won

as Jjang Gu

as Hyun-jun

as Woo-sik

as Kim Myung-ho (16 episodes)

as Choi Yang-up

as Choong-jae [Tooth Worms]

as Bang Young-Baek (12 episodes)

as Self - Mentor (8 episodes)

as Sung Ki-Joon (16 episodes)

as Dokgo Sung-Hyeok (16 episodes)

as Jang Kang-Ho (16 episodes)

as Lee Gwi-Nam (40 episodes)

as Self (4 episodes)

as Lee Jin-ho

as Self (1 episode)

as Byun Ji-hyuk (20 episodes)