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 as

Woo Jeong-won as Yoon-woo's mother

Lee Il-hwa as Koo Do-sun

Park Seong-geun as Director

Lee Yoon-hee as Teacher