A Werewolf Boy— Full Cast

Song Joong-ki

as Wolf-Boy / Chul-soo

Park Bo-young

as Young Sun-yi / Eun-ju

Yoo Yeon-seok

as Ji-tae

Lee Young-ran

as Sun-yi

Jang Young-nam

as Sun-yi's Mother

Kim Hyang-gi

as Sun-ja

Yoo Seung-mok

as Professor Kang Tae-shik

Shin Bi

as Dong-mi

Woo Jung-kook

as Mr. Jung

Goo Bon-im

as Mrs. Jung

Lee Jun-hyeok

as Policeman

Soel Oh-shin

as Thug 1 (uncredited)

Han Min-hik

as Thug 2 (uncredited)

Chuay Kwong-lak

as Thug 3 (uncredited)

Sung Du-hyung

as Man in Black Suit 1 (uncredited)