Countdown

Si-heon

Yoon-woo

Il-sun

Principal

Hwan-ju

Man-deok

Bok-an

Gao

Bok-co

Jody

Song Hee-cheol

President

Reporter

Lee Dong-su

Acting

Yoon-woo's mother

Koo Do-sun

Director

Teacher

Bok-an's Mother