설경구

Sung-geun

박해일

Tae-sik

윤제문

Chief Oh

Lee Byung-joon

Professor Heo

류혜영

Yeo-jeong

장소연

Nurse

이규형

Cheol-Ju

채수빈

Girl (uncredited)

정해균

King Lear (uncredited)

민경진

Principal (uncredited)

허준석

Neurosurgeon (uncredited)

Kim Won-jin

Audition Actor (uncredited)

박민수

Young Tae-sik

손영순

Sung-geun's Mother

배성우

President Baek

이해준