Da Eun has lived in semi-basement apartment for 8 years. She finally passes her civil service examination and she prepares to move out.

Byung Hyun meets Soo Ji at a social dance class. He falls in love with her.

Do Tae Rang must keep things nice and clean all the time. He won't allow any stains. He happens to work at a cleaning service for crime scenes. The service is run by Mo An Na and Do Tae Rang is the company's only employee. While they clean up a criminal site, Mo An Na and Do Tae Rang uncover a truth.