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

as

Yoon-woo's mot...

Lee Il-hwa

as

Koo Do-sun

Park Seong-geun

as

Director

Lee Yoon-hee

as

Teacher