Pah Doyeon, a college student living in an old apartment building, gets used to the thugs coming to her neighbor's door every day. One day, when she sees the thugs trying to break into her neighbor's house, she unwittingly hides her next-door neighbor, Jinju, in her apartment... Looking at Jinju, who is much older than her, Doyeon gradually becomes engulfed in an unknown desire. How will their awkward cohabitation end?