Yoon Jong Woo is a young guy in his 20s, who moved from the countryside to Seoul after his college friend, Jae Ho, offered him a job. While looking for a place to live, he stumbles upon Eden Gosiwon, a cheap apartment 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 Moon Jo, a charismatic dentist. Nevertheless, Jong Woo 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 Woo to start fearing the apartment's residents.