I casually saw it online. It's powerful, really powerful. I'll post it here for everyone to appreciate.
First of all, the protagonist has an incredibly loud name: Mo Hanmode.Wanyan Tom.Barofsky. For convenience, we call him Mo Wanba. And this book narrates the legendary life of this great man.
Volume One: Cultivation and Immortality
In the morning, Mo Wanba went to the public restroom to defecate and met a celestial being. Because the celestial being didn't bring enough toilet paper, Mo Wanba lent him a used piece. The celestial being was deeply moved and thus gave him his entire microscopic world along with all the jade pupil scrolls and magical treasures.