High School Return of a Gangster

Yoon Chan-young

Yi-heon/Kim Deuk-pal

Bong Jae-hyun

Choi Se-kyung

Won Tae-min

Kim Dong-soo

Lee Seo-jin

Kim Deuk-pal

Seo Tae-hwa

Choi Myung-hyun

Kim Se-won

Kim Yeon-ji

Joo Yoon-chan

Hong Jae-min

Lee Kyung-young

The Boss

Shin Min-jae

Mathematics Lecturer

Lee Hee-jin

Song Min-seo

Ko Dong-ok

Jong Cheol

Choi Ji-hye

Min-ji