Yun Jong U is a young guy in his 20s who moves from the countryside to Seoul after his college friend, Jae Ho, offers him a job. While looking for a place to live, he stumbles upon Eden Gosiwon, a cheap hostel that shares the kitchen and bathroom with other residents. He is not thrilled about the quality of the place or the other abnormal residents, such as his next-door neighbor Seo Mun Jo, a charismatic dentist. Nevertheless, Jong U decides to put up with it for 6 months until he saves enough money to move out. However, mysterious events start occurring in the apartment, causing Jong U to begin fearing the apartment's residents.