In Dongpu City, there have been several brutal serial killings with a high level of intelligence. Gu Yifeng, the leader of the crime department, successfully locked the killer on the night of the incident. However, the sixth victim, Li Xianghui, appeared and the killer was arrested. The strangeness of the case was that the evidence in the first five cases pointed to him, and the sixth victim did not match. Who is the killer? The painful truth is torn apart, the wicked are not evil, and each of us is a suspect.