Nayun, a college freshman, only approached the drummer of the campus band 3DAYS to help her best friend get closer to him. But when the band’s handsome vocalist, Seolu, unexpectedly confesses to her that same night, Nayun’s simple plan takes a surprising turn. Convinced that she’s not ready for a relationship, she tells Seolu she’s not looking to date anyone, though her racing heart suggests otherwise. Unfazed, Seolu suggests they just be “good friends” instead. Between his teasing charm and her own conflicted feelings, Nayun soon finds that staying just friends might be harder than she thought.