Forty thousand years ago, the Ghost King Jie, who was appointed by the Ancestor of the Nether King to guard Hell, broke the seal of the Gate of the Nether King on his own, releasing three Primordial Demons of the Underworld that were confined within. This resulted in the destruction of the Eighteen Levels of Hell by the Primordial Demons of the Underworld and allowed the most vicious and nefarious ghosts confined within the Eighteen Levels of Hell to take advantage of the chaos to escape to the mortal world via the Samsara Path.
Latter, only by sacrificing his own Yin Soul, did the Ancestor of the Nether King reseal two of the Primordial Demons inside the Gate of the Nether King, and he also confined the Ghost King Jie, who brewed the disaster, within it.
After the death of the Ancestor of the Nether King, the Crown Prince Feng Yi ascended the throne and became the Second Generation Nether King.