In the city of the worst environmental pollution and housing difficulties, the future Seoul, the protagonist, Shindong, is in a situation where he has to find a new rental house right away with a one-sided notice from the landlord. He cannot afford to move, and one of his friends says that paying monthly rent to rent a part of the house will complicate the rights and make it impossible for the landlord to kick him out. Shindong publishes ad of monthly renting the part of his house on the advice of a friend. But strangely, a strange newlywed couple who wants to live in the bathroom appears, and he takes them in impatiently. However, after a while they start to show bizarre behavior, and the sensitive Shindong can't stand them.