Kim Seolhyun moves to Korea from the States to attend high school. With her luck, she ends up as Shin Hyejeong’s roommate. The two cannot be more different. Hyejeong is your typical high school jock, who has everything except good grades - rich parents, status, and a hot girlfriend. Seolhyun, on the other hand, is the simple, demure new girl everybody loves. Ever since their first meeting, Hyejeong has only been making her life difficult. Seolhyun soon develops a crush on Hyejeong’s best friend. When the popular girl discovers that her best friend actually likes Seolhyun back, she feels an odd sense of jealousy and a fierce rivalry begins.