[Transmigration, urban invincibility, fantasy, multiple female leads, power fantasy]
The Demon Emperor falls, only to be reborn in the modern world by chance.
While he is unconscious, the Longguo military discovers his unusual physique and brings him in for human experiments, but makes no progress.
When the Demon Emperor wakes, Longguo takes the initiative to befriend him. They reach a secret agreement: Longguo will conceal his identity, give him a new one, and help him find his way home. In return, the Demon Emperor will guard Longguo's borders. With him keeping watch, Longguo becomes the world's nightmare, and no nation dares invade. Once Longguo has secured its place at the top of the world, the Demon Emperor leaves military life, returns to the city, and begins a hedonistic new life!
