이제훈

Jang-ho

한석규

Sang-jin

강소라

Sook-hee

이재용

Gang Boss

진경

Mi-sun

배성우

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

오달수

Principle Deok-saeng

Yoon Young-kyun

Delivery man

윤종찬