Time and Space Hunting: I Was a Detective in the Prosperous Tang Dynasty

A modern criminal psychology expert travels back in time to become a demoted county magistrate during the Kaiyuan period of the Tang Dynasty. He is responsible for the "detective system" and needs to solve crimes and accumulate points to return to modern times. The protagonist uses modern criminal investigation techniques to solve ancient crimes, but inadvertently gets involved in a huge conspiracy that attempts to overthrow the Tang Dynasty, and his actions begin to affect the course of history.