Three years ago, forensic doctor Shen Zhiyu resigned from the city's criminal investigation team due to the "material evidence contamination" scandal and became a "marginal person" in the grassroots judicial appraisal center. It wasn't until a female body wrapped in whale bones floated up in a river on the outskirts of the city, and the evidence on the scene pointed to the unsolved "whale falling serial case" ten years ago, that he was recalled to the serious crime team despite controversy. Lu Chengxiao, the leader of the serious crime team, is a well-known "mad dog" who ignores the rules when investigating cases and pursues murderers regardless of the cost, but he keeps a close eye on this "tainted" old colleague. From the "Female Corpse in a Glass Coffin" to the "Amusement Park Puppet Case", the two worked together in each bizarre unit case. Shen Zhiyu's hidden old wounds and Lu Chengxiao's paranoid guarding were gradually exposed. As the investigation deepened, they discovered that all new cases were replicating the tragedy of ten years ago, and the "stain" of Shen Zhiyu back then was actually a dead end set up by someone to cover up the truth. When the murderer targeted Shen Zhiyu, Lu Chengxiao finally broke away from his disguise: "I didn't protect you back then. No one can touch you this time."
Purpose: Use criminal investigation cases as a carrier to explore the relationship between "truth and price" and "protection and redemption", break the "black and white" concept of justice, and show the protagonists' process of sticking to the bottom line and redeeming each other in the shadows. At the same time, through unit cases, it reflects social real problems (such as school bullying, domestic violence, online violence, etc.).