Song Young-chang

as Oh Bong-chan (1 episode)

as Ji Dong-man (12 episodes)

as Moon Sang-guk (10 episodes)

as Kang Yong-ho (16 episodes)

as Jung Baek-jin

as Han Gun-do (16 episodes)

as Director Kang

as Jung-dae / Player 100 (5 episodes), as Im Jeong-dae / Player 100 (6 episodes)

as Baek Kyu-min (12 episodes)

as Sang-gil

as Pastor Jang

as Kim Chun-seong

as Cheon Seong-dae (16 episodes)

as Lee Woon-hak

as CEO Oh (16 episodes)

as Jeong Yi-hyang

as UN Ambassador

as Busan Mayor

as Bae Sang-Do (16 episodes)

as Dang-sook

as Kim Ryu

as Mysterious Man

as New Director of the Headquarters, as New Director at Nuclear Power Plant

as Jo Dong-gun