In one fine day, Song Ji Hyan, a 15 year old from Incheon, was told by her mother to transfer to Seoul. However, even when she does not want to, she transfers to Seoul for her mother's sake. As she arrives to Seoul, she lives in her cousin's house who apparently home studies two teenage boys. The good boy, Kim Tae Hyung; and the bad boy, Jeon Jung Kook . When they encounter each other, she then discovers that Jung Kook and Tae Hyung have fallen for her, and it is up to her to choose between Jung Kook and Tae Hyung.