Park Ho-san

as Yun Gang-cheol (Yun Dan-bi's Father)

as Gong Pil-du

as Lee Seok-woo

as Mr. Kim

as Hwang Cheol-mok

as Colonel Choi

as Baek Cheol

as Jeon Sang-do

as Nam Tae-ju

as Choi Hyun

as Kwon Jong-su

as Jang Min-cheol

as Keanu

as Oh Jung-jin

as Yoo Dong-pil

as Lim Jae-pil

as Ma Bong-deok

as Kwon Yeong-goo

as Chun Seung-Bum

as Park Sang-hoon

as Choi Dae-Hong

as KAIST

as [Detective]