Teach You a Lesson

Kim Moo-yul

Na Hwa-jin

Lee Sung-min

Choi Kang-seok

Jin Ki-joo

Im Han-rim

P.O

Bong Geun-dae

정수현

Park Dae-seok

Jeon Bong-seok

Kim Hyeong-ju

Ok Jin-uk

Cho In-beom

Yoo Tae-joo

Park Seong-hwan

Lee Tae-hwan

Jang Kwon-hyuk

성노진

Principal

Byun Yun-jeong

Hyeong-ju's mother

Kim Chan-hyung

Boss

Lee Sang-hee

Jung Seong-yeong

Park Seo-yun

Han Ye-ri

김세연

Jung So-yeong

Kwon Hyuk

Ko Yeong-su

Lee Si-young

Ms. Jung's Friend

Jeong Seo-yeon

Ko Yeong-su's Wife