Self
Professor Song
Han Yun-sik
R
Chief Nam Kyeong-dae
Shin Jae-yeol
Young-soo
President Yoon
Hwan
Moon-soo
Kim Ki-young
Bae Tae-gon
Moon Dok-bae / Moon Chae-ku
Wan-ho
CEO Jeong (voice)
Pan-gon
Oh Sung-ho
Kwon Yong-hwan
Joo-dong
Me
Sang-won
Narrator (voice)
Kim Kyoo-hwan
Yun Young-hwan
Choo Hyung-Do
Mr. Moon
Father
Jang Se-dong
Himself
Lawyer
Gu Yang-Won
Doctor
Young-cheol
Jeon Sang-ok
Narrator
Kang Ki-chun
Mr. Jang
CEO Jeon
Byung-hak
Jung Ji-yong
Lee Eui-myeong
Vice Principal (Relay)
DJ
Kyung Pil
King Daemusin
Dr. Myung
Do Won Bong [Seongju Prison inmate]
Min Yong-jun
Koo Tae-Won
Kim Tae-Sang
Yoo Han-il
Cha Jonghyeon (Soohyeon's father)
Hong Sun-jo
Won Changho
Hwang In-bum