cast
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Song Joong-ki
Wolf-Boy / Chul-soo
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Park Bo-young
Young Sun-yi / Eun-ju
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Yoo Yeon-seok
Ji-tae
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Lee Young-ran
Sun-yi
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Jang Young-nam
Sun-yi's Mother
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Kim Hyang-gi
Sun-ja
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Yoo Seung-mok
Professor Kang Tae-shik
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Shin Bi
Dong-mi
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Woo Jung-kook
Mr. Jung
- Goo Bon-im Mrs. Jung
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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)
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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)
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Koo Kyo-hwan
Drunk Man (uncredited)
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Kim Eun-sook
Military Chief (uncredited)
- Hong Sung-ki Acupuncturist (uncredited)
- Hung Hi-kwon Hospital Doctor (uncredited)
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Lee Min-woong
Dr. Kang's Assistant (uncredited)
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Nam Jung-hee
Dong-suk's Grandmother (uncredited)
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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)
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Kim Jong-goo
Sun-yi's Father (uncredited)
- Shin Yeong-cheol Eun-ju's Boyfriend (uncredited)