A woman was murdered on the street, and before her death, she wrote the name “Chen Xuelin” in blood.
At first glance, it seemed to point directly to the killer, but the police soon discovered that the deceased’s cryptic message actually implicated a university professor who had been deceased for many years.
After investigation, it was revealed that Chen Xuelin had once been a respected figure, yet he was inexplicably murdered by his own student. As the investigation deepened, Li Zhong, leader of the Criminal Investigation Unit, uncovered that her death was not a heroic act to prove the innocence of the deceased but rather a desperate attempt to expose the sins Chen Xuelin had committed—because she, herself, was unable to let go
