A girl with no home takes a seemingly perfect opportunity to move in with a Professor and his housemaid in a beautiful and secluded mansion. However, the mysteries pile up when the housemaid calls the shots, prevents Young Hee from meeting the Professor, and forces her to follow her strange rules. Fellow housemates Byung Tae and Soo Jung seem to have good intentions when secretly interacting with Young Hee, but just who are they really and why are they there? Leaving may not be as easy as coming into this mysterious house.