Kim Han-yeong

as Hyung-won (12 episodes)

as Kang Hyun-soo (2 episodes)

as Seong Gu-hyeon / Choi Do-seob (2 episodes)

as Electrical Department 6 (1 episode)

as Self (archive footage) (2 episodes)

as Kim Min-hyuk (2 episodes)

as Kim Tae-woo (2 episodes)

as Shin Yi-jun (2 episodes)

as Han Jae-hyun (2 episodes)

as No Ji-hoo (45 episodes)

as Lee Kang-joon (60 episodes)

as Yoon Do-jin (47 episodes)

as Cha Do-hyun (1 episode)

as Ji-hoon (2 episodes)

as Jae-ho (70 episodes)

as Self (8 episodes)