Qin Ming is the top forensic doctor of the modern Ministry of Public Security. He traveled back in time to the Lizong period of the Southern Song Dynasty and became a lowly official in the county government. At this time, the administration of officials in the Southern Song Dynasty was corrupt, unjust, false and wrong cases were everywhere, the powerful were looking down on human life, and the corrupt officials had no say. The protagonist brings a full set of modern forensic techniques, trace inspection knowledge, and criminal psychological profiling capabilities to start a legend of solving cases in ancient times.