Mark of Sin

The story takes place in a modern city and mainly revolves around the case of a serial killer. The protagonist is a young detective who gradually uncovers the dark truth hidden behind the city during the investigation. Main characters: 1. Li Ming: A young and promising detective with a firm personality, not afraid of challenges, and possessing keen reasoning skills. 2. Zhang Ting: A forensic doctor in the police force who is smart and capable and has a deep friendship and tacit cooperation with Li Ming. 3. Zhou Hao: The murderer's psychology expert has established a good cooperative relationship with Li Ming after many times of cooperation and getting along. 4. Lin Xiaoqing: A friend of the victim has key clues, but has always been deeply fearful and uneasy.