There is a strange rumor circulating in the city. Some people who are homeless will sneak into other people's homes, hide themselves, and then live... Zhang Jiawei (played by Huo Jianhua) is the owner of a coffee shop. He lives in a high-end community with his wife and daughter. He lives a rich life and has a harmonious family. However, he suffers from severe mysophobia and obsessive-compulsive disorder. He suffers from mental illness all day long. One day, he received a call asking about his brother's disappearance, and his nerves suddenly became tense. Jiawei, who failed to find his brother in the old apartment, met Su Hong (played by Qin Hailu) and her daughter who lived on the same floor as his brother. Su Hong showed abnormal panic and disgust towards Zhang Jiawei's brother, and the missing case became confusing. At the same time, Zhang Jiawei's wife, daughter and home suddenly became the target of an attack by a "mysterious man". Zhang Jiawei resisted the attack of the "mysterious man" on his family while looking for his brother, thus gradually uncovering a secret hidden in his heart for many years...