I, the Strongest Demon, Have Regained My Youth?!(2020)

Zui Qiang Mo Jun De Wo Turan Bian Xiao Le

In order to maintain his rule, Xin Sheng, the eternal demon king who ruled the world, went deep into the demon realm to find the highest and strongest power. Thousands of years later, he has become stronger and younger, and the world has also changed...

(Source: Bilibili Comics)