Shen Yan was once a specially hired criminal psychology researcher at the police academy. He left the professional field after making an overly bold judgment when participating in the analysis of an unsolved case many years ago, which indirectly caused a suspect to commit suicide. After that, he started live broadcasting incognito, using "criminal identification" as a gimmick to interpret old cases. However, he did not expect that the key details of a certain serial murder case highly overlapped with the model he had studied in his early years, making him a dangerous figure in the eyes of the police and the public.
