A modern office drone transmigrates into Zhu Cilang, the Ming dynasty's crown prince in its final years, just as Li Zicheng's forces besiege Beijing and the empire teeters on the brink of collapse. Rejecting his predecessor's cowardice, he makes ruthlessness his way of life: executing corrupt officials, suppressing traitors within, and fighting the rebel forces in rivers of blood. With bloodshed fiercer than the Jurchens' and methods more ruthless than the rebels', he stabilizes the crisis. From defending the imperial city to pacifying the realm, he ultimately reverses the fate of a fallen dynasty through sheer force, becoming Emperor Tianwu, master of the world.