Siheyuan: Transferred from the Military, but a Master Criminal!

He Yufei transmigrates into the world of the Siheyuan and discovers that he has become a soldier who served in the military for over a decade before being transferred to civilian life. From the start, he joins the security office of a steel mill as deputy head of the security section, earning sixty-eight yuan a month.

But what is this Crime Master System?

As long as he makes sure criminals receive the punishment they deserve, he can gain mastery of all kinds of criminal skills?

Dismemberment, counterfeiting, tomb raiding, robbery, burglary, firearms manufacturing, gambling, even drug production...

Wait, am I really a police officer?

With him in the Siheyuan, the neighborhood patriarchs can only keep their tails between their legs. Yi Zhonghai falls from his pedestal as the paragon of morality, and Qin Huairu's white-lotus image is turned upside down...

In this fiery era, He Yufei takes off with his unreliable System!