Era background: Modern cities are prosperous and orderly on the surface, but secretly evil is entangled like vines. Serial murders occur frequently and the police are exhausted. The criminal police team has become the city's last line of defense.
Identity of the protagonist: Lu Chen, 35 years old, is the leader of the serious crime team of the Municipal Bureau's Criminal Police Team. He was once the youngest criminal investigation expert in the province. Due to the failure to solve a murder case five years ago, he was demoted to a marginal position. Since then, he has a cold temperament and has been a loner.
Core event: Five years ago, the "Rainy Night Butcher Case" was concluded with the suspect's suicide, but Lu Chen always believed that the real murderer had not been caught. Today, a new murder case reappears using the same method - the left ear of the deceased was cut off, and a copper coin with the word "Judgment" engraved on it was left at the scene.
Special setting: Lu Chen has a private "Crime Notes" that records all unsolved cases, and every page is imbued with his obsession. And recently, he discovered that some of the handwriting in the letters were highly similar to the symbols left by the murderer.
Opposing forces: An underground organization called "Scavenger" quietly emerged, claiming to be a justice for heaven and specializing in killing "evil people who cannot be punished by law." In the name of revenge, they actually committed murder, and Lu Chen was their next target.
Key foreshadowing: Lu Chen's sister disappeared in that family massacre five years ago. She was neither alive nor dead. Now, the copper coin found on the newly deceased person is actually engraved with the same pattern as her childhood necklace.
