An unexpected phone call brings an elderly woman to her childhood country cottage, and memories of an orphan boy she knew 47 years ago come flooding back to her.
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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-lan 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)
Cha Jong-ho as Man in Black Suit 2 (uncredited)
Seo Dong-soo as Army Colonel (uncredited)
Jung In-gum as (uncredited)
Lee In-ho as (uncredited)
Oh Yeong-seok as Policeman 2 (uncredited)
Ku Lu-han as (uncredited)
Kim Chul-jun as Construction Worker at Market 1 (uncredited)
Park Young-shik as Construction Worker at Market 2 (uncredited)
Kim Seung-hun as Public Official (uncredited)
Koo Kyo-hwan as Drunk Man (uncredited)
Kim Eun-sook as Military Chief (uncredited)
Hong Sung-ki as Acupuncturist (uncredited)
Hung Hi-kwon as Hospital Doctor (uncredited)
Lee Min-woong as Dr. Kang's Assistant (uncredited)
Nam Jung-hee as Dong-suk's Grandmother (uncredited)
Ahn Do-gyu as Dong-suk (uncredited)
Kim Hae-eun as Woman Renting Mr. Jung's Room (uncredited)
Lee Sung-ju as Sun-yi's Son (uncredited)
Jang seo-yi as Sun-yi's Daughter-in-Law (uncredited)
Jo Jae-yun as Sun-yi's Grandson (uncredited)
Kim Jong-goo as Sun-yi's Father (uncredited)
Shin Yeong-cheol as Eun-ju's Boyfriend (uncredited)