Tiffany, the mysterious girl in SM senior high, she has no friend, but then a new student name Taeyeon became friends with her. In this last year of school they became classmate, and also the famous girl in the school, Yuri and her bestfriend Sooyoung. They are all in the same class. Everyone in the class didnt bother to talk to Tiffany, but then, Yuri found herself teasing the latter, she didnt know why she's so attracted to Tiffany, she even barely know her. 

 Taeyeon, felt jealous knowing that Tiffany is seems happier when Yuri's around. But then, Tiffany's behaviour is changing, it makes Taeyeon and also Yuri confused. What will happen to them???