King Yu, the only king of the underworld for 90,000 years, was actually a black dragon during his lifetime, transformed from the resentment of the unborn fetus of the dragon queen [Ning Yang]. After death, he became an immortal body with no soul but no body.
Thirty thousand years ago, during the genocide battle with the Meizu clan, three souls and seven souls were scattered by the leader of the Meizu [Cang Ming]. One of the souls fell into the world and disappeared without a trace. The underworld spent thousands of years nourishing the souls of countless lonely ghosts and resentful souls to gather the scattered souls of King Yu. The lost soul became King Yu's only weakness.