Overwhelmed by the endless affection of her overly clingy boyfriend Se-in, Roha finally decides to call it quits. But when Se-in keeps acting like nothing ever happened, she starts to wonder…are they really broken up, or still together somehow? In the middle of her confusion, Yeonjun suddenly moves in as a boarder - young, hot and secretly in love with Roha for the past ten years. Between an ex who won’t let go and a long-time admirer living under her roof, Roha’s love life is about to spiral completely out of control. It really wasn't supposed to be like this...