The mythical nine-tailed fox, or gumiho, Lee Yeon had to settle in the city many centuries ago. Able to transform into human form, he eradicates supernatural beings that threaten the mortal world. His real aim is to find the reincarnation of his lost first love.
The talented television producer Nam Ji Ah works in a show that features urban myths. In the past, her parents were involved in a mysterious car accident and disappeared, and she suspects that Lee Yeon might be connected with this accident.
The half-brother to Lee Yeon is the captivating Lee Rang. Despite being half-human himself, he harbors a deep-seated contempt for all people. For sport, he will unleash his seductive prowess upon his human-du-jour, by promising to grant them their wishes, only to trick them into paying a hefty price for their earthly desires.
Yoon Jong Woo 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 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 begin fearing the apartment's residents.
Adapted from a webtoon of the same title by Kim Yong Ki.
Eun Dong Joo attempts to get back her stolen life. When she was 6 years-old, she was abandoned at an orphanage. She did not remember anything except her name. Despite her difficult environment, she has grown into a woman with a positive and bright personality.
Cha Pil Seung is a detective, who is good at his job. His parents died when he was young and he was then raised by his wealthy grandmother. Even though he is popular with women, he doesn't fall in love with anyone due to trauma from his parents' deaths.