This is a story about a girl going through a crisis and a confirmed bachelor who, by fate, become neighbors in the same apartment. 38-year-old Nam Se-hee is lonely and actively avoids socializing with people. He follows his own plan, and the most important things in his life are work, mortgage, and his cat. Thirty-year-old Yoon Ji-ho doesn't have her own apartment but desperately wants to live as far away from her oppressive family as possible. These two convinced loners meet and Ji-ho moves in with Se-hee.