설경구

Sung-geun

Park Hae-il

Tae-sik

Yoon Je-moon

Chief Oh

Lee Byung-joon

Professor Heo

류혜영

Yeo-jeong

Jang So-yeon

Nurse

Lee Kyu-hyung

Cheol-Ju

박민수

Young Tae-sik

Son Young-soon

Sung-geun's Mother

Bae Sung-woo

President Baek

Son Sang-kyung

Big Guy

Jeon Kuk-hwan

President

Lee Jun-hyeok

Gi-cheol

Jeong In-gyeom

Director

김세동

Older Alumnus

이현걸

Bus Jumper Man

Yun Se-hyun

Demonstration Student

Park Min-su

Young Tae-sik

Kim Chul-moo

Another Kim Il-sung

문성필

Audience

Soo-bin Chae

Girl (uncredited)

정해균

King Lear (uncredited)

Min Kyeong-Jin

Principal (uncredited)

허준석

Neurosurgeon (uncredited)

Kim Won-jin

Audition Actor (uncredited)