요양하러 간 한적한 마을에서 소녀는 마치 야생의 짐승과 같이 살고 있는 늑대소년을 발견한다. 왠지 정이 가는 소년에게 소녀는 인내심을 가지고 사람처럼 음식을 먹는 방법, 옷을 입는 방법, 읽고 쓰는 방법을 가르친다. 난생 처음 누군가의 따뜻한 보살핌을 받은 소년은 소녀에게 애틋한 감정을 느끼고 그들은 점점 친밀해진다. 그러나 어느 날 우연한 사건으로 인해 소년의 위험한 야생 본능이 드러나고 소년은 마을의 모든 사람에게 두려움의 대상이 되고 만다.
Summoned by an unexpected phone call, an elderly woman visits a cottage she used to live in as a child. She begins to recall her memories of a boy she knew 60 years ago. A young Suni and her family move to a small rural village in Korea. There, they encounter a strange 'wolf boy' hiding under a bush and take him in out of pity. Bothered by his wild eyes and feral behavior, Suni teaches the boy to wait patiently before a meal, put on clothes, and read and write the alphabet so that he can one day live like other human beings. Slowly, the boy begins to develop feelings for Suni, the first person to ever show him affection. Then one day an unexpected threat exposes the boy's deadly bestial instincts, and in an instant he becomes the subject of the villagers' fears. Desperate to save the life of the boy who risked his own to be by her side, Suni leaves him with a promise: 'Wait for me. I'll come back for you.'