Hajin Seo used to be a cheerful girl. But while trying to protect her friend Mina, she had to commit a series of things that led her to think she killed the friend. Mina, however, is not dead but she is now in a dangerous state. A teen star named Yunu who met Hajin before the incident wants to see her old self again. He wants to bring his first love back to how she was before. The hot Jeha Han is nice to her, the loner girl, at first. But he has a secret. He is Mina's brother, and he is willing to do anything to get revenge on the person who harmed her. Hemi and Yungju will pair together in order to get their unrequited love fulfilled. Hemi wants Yunu, and Yungju wants Jeha. And all their arrows are pointed at Hajin, who has already been hurt. Once she was an angel, the popular girl of the school. But now she is a fallen one, one that can only watch from behind as many go against her.