M*rder Puzzle Code

In the prosperous Jianglong City, women and children disappear every day, and strange clouds gather over the city. A puzzle piece was sent to the police station, and the clues pointed to the recent frequent disappearances. The police discovered that this was not an ordinary puzzle piece but human skin, and it came from the mu*derer of another case. Is it the mu*derer? Or the victim? Who is the perpetrator? Yu Jing, the leader of the Serious Crime Team Two, grew up among gangsters and made jokes on weekdays, but when it comes to serious matters, he immediately becomes serious and leads his men straight to the scene. He discovered that the clues in the case were very similar to an old case...