Nonton Girl by Girl (Sonyeo x sonyeo) (2007) Sub Indo

Two students fall in love with the same guy--one is a model student, and the other is a troublemaker. The troublemaker makes up a lie and tells the model student that the guy actually likes troublemakers. So, the model student tries to make herself more wild to attract his attention. Meanwhile, and troublemaker tries to become a model student in order to win over the guy.