Eun-gyo, after breaking up with her trashy ex-boyfriend, runs a café with her friend Kim Hae-da, enjoying a peaceful everyday life. But this tranquil existence is disrupted by the arrival of a new person. "Sunbae, I like you. It was love at first sight." Lee Jae-heon, young, handsome, and with a slightly twisted side. Eun-gyo, too, begins to feel drawn to Jae-heon who boldly approaches her. However... As Eun-gyo's life is already shaken by this new relationship, even bigger waves begin to crash upon her.