Yoon Chan-young

Yi-heon/Kim Deuk-pal

윤찬영

봉재현

Choi Se-kyung

원태민

Kim Dong-soo

Lee Seo-jin

Kim Deuk-pal

이서진

서태화

Choi Myung-hyun

김세원

Kim Yeon-ji

Joo Yoon-chan

Hong Jae-min

Lee Kyung-young

The Boss

이경영

신민재

Mathematics Lecturer

Lee Hee-jin

Song Min-seo

이희진

Ko Dong-ok

Jong Cheol

Choi Ji-hye

Min-ji