Countdown

Jin Sun-kyu

as Si-heon

Sung Yu-been

as Yoon-woo

Oh Na-ra

as Il-sun

Ko Chang-seok

as Principal

Jang Dong-ju

as Hwan-ju

Ko Kyu-phil

as Man-deok

Kim Min-ho

as Bok-an

Lee Jong-hwa

as Gao

Choi Hyung-tae

as Bok-co

Cho Jung-hun

as Jody

Tae In-ho

as Song Hee-cheol

Cha Soon-bae

as President

Lee Jun-hyeok

as Reporter

Lee Hong-nae

as Lee Dong-su

Woo Yeon-seo

Woo Jeong-won

Lee Il-hwa

as Koo Do-sun

Park Seong-geun

as Director

Lee Yoon-hee

as Teacher