The undercurrent of the city on a rainy night surges. The new genius detective Lin Yunmo has just taken over the serial murder case of a wealthy man, and unexpectedly partners with the mysterious forensic doctor Su Li. As the investigation deepened, they were surprised to find that the deceased were actually related to an unsolved case twenty years ago, and the clues pointed directly to Lin Yunmo's father who had been missing for many years.
The theft of cultural relics from a museum leads to a transnational crime syndicate. During the investigation, Lin Yunmo learns that his father may be the real culprit in the unsolved case. A doctor from a mental hospital disappears mysteriously, and the mystery of his life experience gradually emerges. Su Li's hidden true identity adds to the mystery of the case. The leader is kidnapped, and evidence of collusion between the criminal group and the police high-ups emerges. The key witness is suddenly killed before he can testify, and the truth passes by time and time again.
When Lin Yunmo finally gets closer to the truth about his father's death and begins a final showdown with Boss Wu, the leader of the criminal group, and Captain Chen, who is both good and evil, the boundaries between justice and revenge gradually blur. What is the hidden price of this mystery that spans twenty years? The open ending of Chapter 500 leaves unfinished suspense for this dark night chase.
