A murderous crime occurred again on a rainy night, and the crime was committed with a sense of ritual, hiding the obsession for revenge.
The cold-blooded criminal policeman Lu Yan bears the old pain of his sister's disappearance, and the cold-blooded forensic doctor Lin Wan holds a certificate to find the murderer. The two join forces.
Find the truth from the ashes of the corpse, protect each other in the fog of sin, the day when the old case is revealed is also the time of redemption for each other.
