You're referring to the 2012 South Korean film "A Werewolf Boy"!
The plot is deceptively simple: Caleb moves in with his gruff, no-nonsense grandmother (a brilliant Kathy Kinney) after his mother’s disappearance. He refuses to eat dinner with her, sleeps with his window open in freezing rain, and has a habit of disappearing for three nights each month. The local livestock start turning up eviscerated, but the film wisely sidesteps the typical “who is the monster?” mystery. We know it’s Caleb. The question is: what kind of boy will he choose to be? a werewolf boy movie
Most werewolf boy movies share a specific DNA that keeps fans coming back: You're referring to the 2012 South Korean film
The success of a werewolf boy movie often hinges on the transformation scene. In the early days, filmmakers relied on practical makeup and time-lapse photography. Today, high-end CGI allows for seamless, bone-crunching transitions that look terrifyingly real. However, many fans still prefer the "old school" feel of prosthetic hair and animatronics, which provide a tactile sense of weight to the monster. Why We Keep Watching Archetype: The Scientist / The Hunter
The film's pacing is well-balanced, moving smoothly between humor, drama, and romance. The werewolf transformation scenes are creative and visually appealing, adding a touch of fantasy to the story.
The film follows a sickly teenage girl who moves to the countryside for her health. There, she discovers a feral, non-verbal boy hiding on her family's property. Rather than fear him, she begins to civilize him—teaching him how to eat, read, and live like a human. As an extraordinary bond forms, she realizes he isn't just a wild orphan but a creature with dangerous, hidden powers. Why You Should Watch Heart-Wrenching Performance: