Yang Yoojin (you) is Lee Changsun’s (Joon) rival in everything ever since middle school. Even when they are in high school, they are still competing with each other in everything. Both of them are always the smartest students in their school. She also can do ballet as good as Joon. She is the queenka with her body and brain while Joon is the kingka. Everyone thinks they will make a cute couple but Yoojin doubts they will get along since she hates Joon very much and he also looks like one. She hates it when Joon wins over her and vice versa. They never talks to each other in peace, they always fight with words. But lately, sometimes Joon acts a bit nice towards her even though she is still cold as ever towards him.

Only Yang Yoseob, Yoojin’s younger brother, knows that actually Joon hides something from her that makes him behave like that.