Top Billed Cast

1. 

   Song Joong-ki

   Wolf-Boy / Chul-soo

2. 

   Park Bo-young

   Young Sun-yi / Eun-ju

3. 

   Yoo Yeon-seok

   Ji-tae

4. 

   Lee Young-lan

   Sun-yi

5. 

   Jang Young-nam

   Sun-yi's Mother

6. 

   Kim Hyang-gi

   Sun-ja

7. 

   Yoo Seung-mok

   Professor Kang Tae-shik

8. 

   Shin Bi

   Dong-mi

9. 

   Woo Jung-kook

   Mr. Jung

10. 

    Goo Bon-im

    Mrs. Jung

11. 

    Lee Jun-hyeok

    Policeman

12. 

    Soel Oh-shin

    Thug 1 (uncredited)

13. 

    Han Min-hik

    Thug 2 (uncredited)

14. 

    Chuay Kwong-lak

    Thug 3 (uncredited)

15. 

    Sung Du-hyung

    Man in Black Suit 1 (uncredited)

16. 

    Cha Jong-ho

    Man in Black Suit 2 (uncredited)

17. 

    Seo Dong-soo

    Army Colonel (uncredited)

18. 

    Jung In-gum

    (uncredited)

19. 

    Lee In-ho

    (uncredited)

20. 

    Oh Yeong-seok

    Policeman 2 (uncredited)

21. 

    Ku Lu-han

    (uncredited)

22. 

    Kim Chul-jun

    Construction Worker at Market 1 (uncredited)

23. 

    Park Young-shik

    Construction Worker at Market 2 (uncredited)

24. 

    Kim Seung-hun

    Public Official (uncredited)

25. 

    Koo Kyo-hwan

    Drunk Man (uncredited)

26. 

    Kim Eun-sook

    Military Chief (uncredited)

27. 

    Hong Sung-ki

    Acupuncturist (uncredited)

28. 

    Hung Hi-kwon

    Hospital Doctor (uncredited)

29. 

    Lee Min-woong

    Dr. Kang's Assistant (uncredited)

30. 

    Nam Jung-hee

    Dong-suk's Grandmother (uncredited)

31. 

    Ahn Do-gyu

    Dong-suk (uncredited)

32. 

    Kim Hae-eun

    Woman Renting Mr. Jung's Room (uncredited)

33. 

    Lee Sung-ju

    Sun-yi's Son (uncredited)

34. 

    Jang seo-yi

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

35. 

    Jo Jae-yun

    Sun-yi's Grandson (uncredited)

36. 

    Kim Jong-goo

    Sun-yi's Father (uncredited)

37. 

    Shin Yeong-cheol

    Eun-ju's Boyfriend (uncredited)