In rural 1982 South Korea, a feared girl gang runs the local high school, led by Young Sook (Park Bo Young). Although she’s known for her rough-and-tumble ways, she has a weakness: her crush on Joong Gil (Lee Jong Suk), the school’s charming playboy who’s tried to woo everyone at the school except her. When So Hee (Lee Se Young), a beautiful new transfer student from Seoul arrives, Joong Gil immediately develops a crush on her, inciting Young Sook’s ire. Young Sook and So Hee quickly develop a rivalry, made worse when Gwang Sik (Kim Young Kwang), the leader of a rival school's male gang with his own feelings for Young Sook, decides to get involved.