윤시윤

Baek Se-jin

여진구

Lee Byung-joo

천호진

Seok-gu

이경영

Principal

박상면

Byung-joo's father

이원종

Jong-hee's father

공정환

Jeong-hwan

김보미

Yi-hwa

Yoo Seo-jin

Anna

Je Seong-soo

Gang of Four