- Country: South Korea
- Genres: Fantasy, Romance
- Release: 2012-11-30
- Director: Sung-hee Jo
- Writers: Sung-hee Jo
- Language: Korean
- Stars: Joong-Ki Song , Bo-Young Park , Yeong-ran Lee , Young-nam Jang
- Runtime: 122 min
- Awards: 4 wins & 9 nominations.
- AKA: O Garoto Lobisomem (Brazil) , Мальчик-оборотень (Russian Federation) , Neuk-dae-so-nyeon , Sói - Hôi Kêt (Vietnam) , A Werewolf Boy , A farkasfiú (Hungary) , 私のオオカミ少年 (Japan) , Neukdae sonyeon (Korea) , 狼少年：不朽的愛 (Taiwan) , A Werewolf Boy (United Kingdom) , A Werewolf Boy , Sói (Vietnam) , Neuk-dae-so-nyeon (Korea)
- Plot: An offer to buy her property brings elderly Kim Sun-yi back to the country cottage she briefly lived in during eventful times in her youth. With her granddaughter by her side, Sun-yi recalls meeting Cheol-su, not only a feral orphan from Korean war days but a mute boy genetically spliced with wolf DNA by a rogue scientist, now deceased. She effectively tames the unsocialized lad through dog obedience training, and he soon becomes more than a loyal companion, protecting her from the rude advances of her late father's business partner's ne'er-do-well, spoiled, self-centered son, Ji-tae, who fully expects Sun-yi to marry him someday. He would claim her as his own sooner than that if not for Cheol-su, who transforms into an unbeatable werewolf anytime someone threatens a member of his pack, leading Ji-tae to work towards a permanent solution to this problem.
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