Jeongmin is a loner in high school being bullied by the Queen Bee, Juhyeon. The two were friends in elementary school before their friendship ended because of Juhyeon's demand that Jeongmin should only be friends with her. Juhyeon uses this "betrayal" to fuel the classmates' insults and isolate Jeongmin in misery. Jeongmin has only one way to escape, through lucid dreams. One day, a mysterious man enters her dreams and offers to help her get revenge on Juhyeon...