After breaking up with her trashy ex-boyfriend, Jung Eunkyo spends her days peacefully running a café with her friend Kim Haeda. But then, someone appears to disturb her calm life. “Sunbae, I like you. I fell in love with you at first sight.” Lee Jaeheon, a young, handsome man who seems to have a twisted side. Eunkyo begins to feel attracted to Jaeheon, who approaches her without hesitation... But Eunkyo’s life, which was already shaken by this new relationship, gradually begins to experience greater turmoil.