Cast

Song Joong-ki

Wolf-Boy / Chul-soo



Park Bo-young

Young Sun-yi / Eun-ju



Yoo Yeon-seok

Ji-tae



Lee Young-ran

Sun-yi



Jang Young-nam

Sun-yi's Mother



Kim Hyang-gi

Sun-ja



Yoo Seung-mok

Professor Kang Tae-shik



Shin Bi

Dong-mi



Woo Jung-kook

Mr. Jung



Goo Bon-im

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)



Cha Jong-ho

Man in Black Suit 2 (uncredited)



Seo Dong-soo

Army Colonel (uncredited)



Jung In-gum

(uncredited)



Lee In-ho

(uncredited)



O Yeong-seok

Policeman 2 (uncredited)



Ku Lu-han

(uncredited)



Kim Chul-jun

Construction Worker at Market 1 (uncredited)



Park Young-shik

Construction Worker at Market 2 (uncredited)



Kim Seung-hun

Public Official (uncredited)



Koo Kyo-hwan

Drunk Man (uncredited)



Kim Eun-sook

Military Chief (uncredited)



Hong Sung-ki

Acupuncturist (uncredited)



Hong Hee-won

Hospital Doctor



Lee Min-woong

Dr. Kang's Assistant (uncredited)



Nam Jung-hee

Dong-suk's Grandmother (uncredited)



Ahn Do-gyu

Dong-suk (uncredited)



Kim Hae-eun

Woman Renting Mr. Jung's Room (uncredited)



Lee Sung-ju

Sun-yi's Son (uncredited)



Jang seo-yi

Sun-yi's Daughter-in-Law (uncredited)



Jo Jae-yun

Sun-yi's Grandson (uncredited)



Kim Jong-goo

Sun-yi's Father (uncredited)



Shin Yeong-cheol

Eun-ju's Boyfriend (uncredited)



Seol Woo-sin

Gangster 1