Everyone sees her as the cute, innocent and playful girl, but nobody has seen her real side. Her y side. She's a brat and has a habit to complain about things. On stage she's sweet and innocent with the members but off stage, she's the most hateful by her members.

Mimi came from one of the richest family in Seoul. But there's a big twist in her life. All her life she thought she is with her parents but she was actually adopted. She was found inside a basket when she was young, It has been said that her own mother left her. As time goes by, she started to rebel, until both of her parents died in a plane crash. She became poor and she hates it, as she trains in SM, she vows to work hard and change her bad attitudes.

If Mimi thinks she can easily fool all of the exo members that she is cute and adorable, well, she's wrong. Awfully wrong. There is this one guy who knows her real side, and he is no other than Byun Baekhyun. From the very beginning, eversince they met, Baekhyun knows that there is something is wrong with her, and he will prove it right.

Baekhyun is known as the eyeliner diva of Exo. He easily makes friends. He really hates two faced girls, and one of them is Mimi. He can easily tell if a girl is fake or not, no one can fool this guy.

Baekhyun hates Mimi. Mimi feels the same. Their feelings were mutual, they both despise each other. But there is only a thin line seperating from Love and Hate, right?