Almighty Video Game Designer - Chapter 9

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

When the pure lotus provoked her, she slapped her instantly, “It's just a pair of worn-out shoes. If you want them so desperately, take them and wear them.”President Jones intruded with a cheeky face, “Wife, even if they're worn-out shoes, I'd only let you wear them.”“Scram!”...【One man, one woman】Four years ago, she left in fury with the bun in her oven. Four years later—“Uncle, I noticed that your face has a gloomy look, it looks like you have excessive liver heat. It's obvious you lack a wife. Do you want to get to know my mommy?”The president who remained aloof from women looking at his mini-me, his eyes deepened. He immediately packed up the mother and child, and brought them back home, pampered them to the point of annoying everyone.Someone asked, “President Jones, isn't this a bit too unreasonable?”The president smirked coldly, “You expect me to be reasonable when pleasing my wife?”This is a story about an overbearing President Jones, who's fiercely dominant, and unreasonable in pampering his wife.

As his contract-marriage wife, she just wanted to fulfill the mission given by his mother—having a baby. They didn't love each other, so he always used contraception before they got laid. She had been obedient to him, only to find that he had gone too far! He actually didn't care about their child at all! She couldn't stand it anymore, so she handed him the divorce papers and left, noting: “The world is so huge that I can surely find a better man.”Looking down at her, he retorted, “Come on, your purse strings will tighten up first before you find anyone.”

A master assassin transmigrates into an interstellar era.

Other players were responsible for competing in the e-sports arena, while he was responsible for stringing up and beating up the other players.

His sword was hidden during the peak of day, and he was a gentleman who arrived in a flash of light;
As a vanguard of the eternal night, he was the variable between life and death in the world.

“As you know, the Star League’s difficulty levels are arranged in this way:
Paradise < Simple < Normal < Difficult < Nightmare < Hell < [Tyron Odin]”

- Description from Novelupdates