Choi Won-young

as Sang-hun

as Choi Dong-hyeon

as Shin Gi-jung

as Kang Myeong-hwi

as Lim Sa-hyeong

as Mr. Hong

as Yun Jeong-jae

as Baek Seung-gi

as Jug Gi-yeong

as Eun-gyeol's Father

as Nora's Dad

as Ha Young-doo

as King Lee Ho

as Hwang Hyeon-do

as Self

as Kim Kang-su

as Lee Chan-young

as Lee Shi-heum

as An Hyeon-seong

as Hwang Hee-tae (adult)

as Jeong Yak-jong

as Kim Yoon Cheol

as Detective Kang

as Seok Oh-won

as Team Leader Gwi

as Self

as Hong Yoon-sung

as Hwang Seok-Joo

as Lee Jae-Joon

as Hwang Chi-young

as Han Jae-young

as Jang Pil-Sung

as Joo Hyun-Ki

as Nam Chul Doo [Hong Joo's father]

as An Ji-Gong

as Sung Tae-Pyung

as Cha Jae Gook

as Kim Woo-Cheol

as Tae-seong

as Lee Joon-ho/Lee Joon-yeong

as Chief Ahn Gook

as Chae Je-gong

as [Climbing coach]

as Kim Do-jin

as Kang Byung-soo

as Dong-kyu

as Yoon Jae-ho

as Seok-ho

as Ki Soo

as Kim Chul-gyu

as Jung Tae-suk

as Ji-hoon

as Self

as Yoon Min-joon

as Jack (voice)

as Park Sung-chul

as Chae Ki-hoon

as General Gyebaek

as Seok Ho

as Han Joon-seok

as Han-seok

as Park Chan-soo