Modern young man Xiao Jin transmigrates into the body of the villainous heir of Prince Jing and activates the All Evils Return to Their Source System. He initially plans to rack up villain points by committing all kinds of outrageous misdeeds in Hanshui County, his impoverished fiefdom, then return to the modern world with a huge fortune. Unexpectedly, every evil deed he commits backfires in the best possible way, transforming the poor county into a thriving land where every industry flourishes. After secretly inspecting the county, the emperor showers him with rewards. Jealous, the crown prince raises an army and launches a rebellion. Xiao Jin is forced to fight back and earns yet another great merit. In the end, he abandons his obsession with returning home and becomes a wise prince who guards and governs his territory.