The drama is based on the theme of "30-year-old unmarried youth" and tells the story of the young generation who cannot afford to buy a house in real life. Nam Se-hee (Lee Min-ki), a house slave who only owns the entrance of the house, meets Yoon Ji-ho (Jung So-min), a homeless person who can never afford to buy a house. After the two move into the same house together, sparks of love gradually begin to emerge.