Oh Sehuna's a new transfer student at SM High. She's hard to miss with her long brown hair, gracious legs and crazy gang of friends. After moving between sixteen different schools, all of them she had been bullied at, her parents send her off to SM High - a Chinese-Korean boarding school. - There she moves into a dorm with eleven girls, who all have their own unique personalities. Xi Lulu, Sehuna's new best friend, has been bitter about her break-up with Jonghyun for a very long time and desires revenge. But as Sehuna gets pulled into Lulu's plans, and the madness of the other girl's problems, she starts to believe that maybe she can finally have a normal and happy teenage life... well, at least most of the time.