Emperor Yin couldn't accept that someone who misled the Netherworld could love it more than he did.
Therefore, he concluded there must be some hidden story.
It must be that the Netherworld still harbored some secret of Jiang Lu's, or perhaps the Netherworld was deeply poisoned, necessitating a drastic cleanse.
And he had been longing for the Underworld for more than just a day or two.
Even before formal diplomatic relations were established between the Netherworld and Mount Olympus, he had set his sights on the Underworld.
Because of Zeus's invitation to Jiang Lu to cook with the female prisoners in the Underworld in the future, he believed the Underworld was a debauched den just like the Netherworld, filled with sin, in need of someone like him to shine the light of justice upon its lands.