Kuro no Maou - Chapter 515

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

In an apocalyptic world where resources are limited and only the rich gets to survive, money is not a want; It's a need.Terrence Ardwil is a man who has been loyal to the government his entire life. He is part of the “Mission for Life” unit— a unit created to lessen the human's total population in the hope of making humanity survive even longer.He was already satisfied with how he lived until an incident happened that resulted in his unfortunate death.When he thought he had died, he suddenly fell from the sky and woke up 2 years back in time.Be it getting rich, saving humanity, or building his own empire? With the special system he acquired, he is determined to make everything possible in his second life![Ding! The Money Making System has successfully chosen you!]

Traveling to a parallel world, Gu Miao became a hard-working animation director.

When he emerged from “Pleasant Goat and Big Big Wolf” and successively produced many phenomenal and explosive animations such as “Bear Infested”, “Happy Baby”, “Super Beast Armed”, “Guobao Special Attack”, the industry suddenly set off a sensation. There is an upsurge of “traversing themes”.

Facing the reporter’s interview, Gu Miao waved her hands and said confidently: “No one knows time travel better than me!”

Thus, “Digimon” was born…

- Description from novelbuddy

King Grey has unrivaled strength, wealth, and prestige in a world governed by martial ability. However, solitude lingers closely behind those with great power. Beneath the glamorous exterior of a powerful king lurks the shell of man, devoid of purpose and will. 

Reincarnated into a new world filled with magic and monsters, the king has a second chance to relive his life. Correcting the mistakes of his past will not be his only challenge, however. Underneath the peace and prosperity of the new world is an undercurrent threatening to destroy everything he has worked for, questioning his role and reason for being born again.