One Piece: The Devil Fruit Collector - Chapter 253: Hebi (Snake), Sword God!

Gu Yang crossed over to a high-martial world, eked out a living in small village for two years, and finally saved up enough and activated the Life Simulator system.

With a certain amount of money, a simulation can be run.

After the simulation ends, one of the three can be retained: realm, martial arts skills, or life wisdom.

[For five years you were an accountant, saved up enough money to buy a cultivation manual, practiced hard for ten years and became a Ninth Realm martial artist, but then ran into an enemy and died!]

[Once you left the mountains, you were at the Ninth Rank, became a protector of a certain family, practiced intensely for twenty years, broke through to the Eighth Grade, and ultimately, died of old age in a small town.]

[Once you left the mountains, you were at Eighth Grade, received recognition from a noble clan, were taught profound martial arts, but due to slow progress, were marginalized, and after a dozen years, you finally broke through to the seventh grade, but then encountered powerful foes on a mission and were killed.]

…

After countless rounds of simulations: [You encounter people, but none are a match for you. You realize that you have become invincible.]

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Arthur is an Atelier who works under pressure. When the curse of the Succubus activates his Netori System, Arthur is unable to resist his desire to win a woman's loyalty. There is no other reason for him to test a woman's loyalty that is easily shaken when his Netori System is activated.

The constant mission is getting redemption.

Shuttle though various worlds to become a variety of scum men, do a little whitewashing and become a good man in the eyes of everyone.

Redeem those who are miserable, and let them live a happy life.

- Description from Novelupdates

Have you often come across a game where you start with a bonfire, surrounded by ice and snow, with resources all manually transported, and monsters attacking at any time...Xia Hong wakes up to find himself in such a world.The ice and snow rage on, beasts rule the land, civilization is lost, and all people and things that once existed have been invaded into powerful and bizarre entities, leaving humans as a humble race surviving in the shadow of winter, on the brink of extinction.Fortunately, Xia Hong possesses a camp system that can upgrade infinitely.[Small Bonfire]—[Iron Furnace]—[Solar Cauldron]...[Wooden Post]—[Training Ground]—[Martial Arts Hall]...[Bamboo Fence]—[Black Soil Wall]—[Iron Wall]...[Monument Stone]—[Notice Board]—[Hero's Monument]......As Xia Hong slays the beasts and exterminates the bizarre entities, gradually gathering humans, dispelling the winter, and opening up territory, the mysterious veil of this world is slowly unveiled in its entirety.