늑대소년

송중기

Wolf-Boy / Chul-soo

Park Bo-young

Young Sun-yi / Eun-ju

유연석

Ji-tae

이영란

Sun-yi

장영남

Sun-yi's Mother

김향기

Sun-ja

유승목

Professor Kang Tae-shik

Shin Bi

Dong-mi

우정국

Mr. Jung

?

구본임

Mrs. Jung

Lee Jun-hyeok

Policeman

?

Soel Oh-shin

Thug 1 (uncredited)

?

Han Min-hik

Thug 2 (uncredited)

?

Chuay Kwong-lak

Thug 3 (uncredited)

?

Sung Du-hyung

Man in Black Suit 1 (uncredited)