Qin Wanning is a calm and rational forensic doctor who never makes a mistake under the scalpel, but she falls into a nightmare because of a corpse whose heart was precisely removed. The murderer's method was exactly the same as her father, a "serial killer" who was convicted twenty years ago.
Criminal psychology expert Qi Mo was ordered to assist in the investigation. He was keenly aware of Qin Wanning's unusual familiarity with the case, and even discovered that she secretly hid her father's research notes. From mutual suspicion to being forced to cooperate, the two gradually approached a cruel truth among the corpses that appeared one after another and the clues of silver coins deliberately left behind: the real murderer of the year was still at large, and the new killing was a carefully planned revenge.
When "evidence" pointing to Qin Wanning appeared at the death scene of the fifth victim, and when Qi Mo was asked by his superiors to monitor this partner whose relationship was becoming increasingly difficult to define, the two had to confront each other in an abandoned factory in a heavy rain. The appearance of the mysterious murderer tears apart the last disguise, revealing a bloody entanglement spanning two generations - it turns out that all murders began with a misdiagnosed murder case handled by Qin Wanning's father...
Purpose: The French Open will be restored without leakage