이제훈

Jang-ho

Han Suk-kyu

Sang-jin

강소라

Sook-hee

Lee Jae-yong

Gang Boss

Jin Kyung

Mi-sun

Bae Sung-woo

Sang-jin's Alumnus (uncredited)

조진웅

Chang-soo

김지석

Drunken Man (cameo) (uncredited)

이상훈

Teacher

Yoon Yeong-gyun

Delivery Man

Yang Han-yeol

Ji-min

Oh Dal-su

Principle Deok-saeng

Yoon Young-kyun

Delivery man