Im Sung Wan eaves Busan and reaches Icheon to find a job. She searched for apartments to stay in but they were expensive. A creepy stranger suggested her, The Peace place. The apartment was old, creepy, and cheapest. She couldn't afford an expensive apartment so she planned to live there. It was hidden in an unpopular, small, and not well-developed town. A rumor was popular in that apartment, "Below the stairs, lives a devil" In past years, a lot of people disappeared who stayed in that apartment or tried to go to the basement. The thrilling mystery of the devil and disappearing people is highlighted in this series, also showing a crime-fiction. A little bit idea extracted from the popular kdrama "stranger's from hell"