Even in the Netherworld, unless his realm advanced, it would be difficult for his power to increase further.
However, advancing his realm was not what he wanted.
Thus, remaining in the Netherworld would only be a waste of time.
In the Netherworld, from the forty-sixth to the fifty-fourth Layered Cosmic System, the time ratio compared to the Spirit World was one million to one, but the time he experienced in those layers of the Netherworld truly added to his age!
Unable to rapidly increase his strength, he couldn't stay in the higher layers of the Netherworld for too long, otherwise, when he broke through to the New Layered Heaven again, it might affect his age standard!
So, although spending time in the Spirit World took longer, he had to come to the Spirit World!
"This is a universe of the forty-five-layered heavens. However, there aren't too many spirits here..."