MTL - Reborn with an Old Enemy on the Day of our Marriage - ~ 30. As you can see

The end of the world is coming, the world has undergone great changes, and everything has changed. Plants, animals, and even insects, as long as there are living things, have mutated.
Become more powerful, and even evolved supernatural abilities, such as chickens and ducks that can fly to the sky, such as cats and dogs that can breathe fire.
But only humans, without any obvious changes, seem to have fallen from the top of the food chain to the bottom of the food chain overnight.
Any creature that can open its mouth to eat can treat humans as food.
But fortunately, this world has not completely killed humans. Gradually, humans discovered that they had the ability to cultivate compatibility with other creatures.
As long as it has a high degree of compatibility with some powerful mutant creatures, it can be used for its own use to achieve the purpose of protecting itself.
Fang He is a person who is very compatible with mutant animals, but it is also because of his ability that he has changed from the strongest to the stupidest.
Fang He, who was reborn, said, “Hmph, this time…”

- Description from novelbuddy

A Professional Transmigrator meets a newbie Regressor.

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He lived an average, fulfilling life and died of old age. The next moment, he opened his eyes as the Princess of Asmaria.

While looking forward to his new life, he died again.

And so began his 151,897,914th life as Samur Eckart.

Samur is a Professional Transmigrator- or so he says so, as he gets transmigrated into a new world every time he dies.

However, each time, his memories return only moments before his death. If he successfully survives, he gets to live that life, if he dies, well, he just moves on to his next moment of death.

Once again on the verge of death as Samur, he’s saved at the last moment by a young boy.

Surprise, surprise, the young boy is a Regressor.

As a man of honour, Samur intends to repay his debt then leave because the world is too inconvenient to live in.

Well, that’s what he thought, at least, but the Regressor and his friends are kind of… weird, and he can’t seem to get away at all?

However, not everything is as it seems. Samur’s whims have made him the part of an eternal lie.

Shadows dance in glee as they concoct a requiem far grander than anyone can imagine, while the Lights tremble in delight as the apocalypse threatens the Universe.

The dies have been cast, the play has been written, the characters are on the stage, and the sacrifices have been made.

And so, it’s finally time to let this game begin.

Unique skill ‘creditor’ which can bet with its debtors on the unpaid debts.

And the ability to take skills and stats!

Kang Yoo-sik’s chance to start a new life at the Hunter Military Academy.

“Do you think sleeping with you once isn't enough after what you did to make me famous? Would you do it a second time?”Li Qingshen remained silent.Ling Momo pouted before biting her finger. “Ten times?” She asked.Li Qingshen still remained silent.Ling Momo tugged at her own hair. She clenched her jaw. “Twenty times?”Li Qingshen turned around to leave.Ling Momo was frantic. She stomped her feet. “Is twenty times still too little? You can't possibly want a hundred times.”Li Qingshen smiled. “That'll do...”