Detective: Solve the Case from the Death Notice

In an era that cannot be verified, there was a metropolis called "Decheng" in the south of this country. This place brought together all the forces from all over the world. However, the reality of Decheng City is exactly the opposite of its name. Decheng City is a mixed bag of good and bad people, a place where morality is lost and crime is rampant. People here are old, evil thoughts are erratic, and crimes occur frequently. Until someone comes! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.