One Piece: So What If I Sin, Lie, and Lust? I'm Still a Good Marine - Chapter 552: Volume 4 – - 71: The Vanishing of the City of Gold

Violet skies, a world undergoing massive changes, a deficient moon, interlinking voids…
When the world experienced a cataclysmic event,the majority of living things ceased to exist. Although humanity survived by hiding in the last safe zones, humans had to face mutated dire beasts and colossal source beasts that could break through the space barrier and enter the earth at any second.
Luo Yunyang, a young man who grew up in those calamitous times, obtained an attribute regulator and set out to walk the path of supremacy!

- Description from novelupdates

Found a suitable body named Bai Xiao. Reincarnating into the World of Elementalists.

“Mission: Overpopulation of carnivorous fish in the lagoon.

Please kill 666 carnivorous fish in order to prevent the destruction of the lagoon’s ecosystem.

Reward: 20 Balance Points.”

“Mission: Forest fire.

Extinguish the fire.

Reward: 200 Balance Points.”

- Description from Novelupdates

Before his death, he was the only sword cultivator in the whole world, who dedicated his entire life to the path of sword immortality.

When he opened his eyes again, the world had completely changed. He began to cultivate the path of sword immortality again, slaying the heavenly way, shattering the universe with his will, and achieving the realm of sword immortality!

- Description from Novelupdates

For better or for worse, till death do us part. That was their vows at the altar, but he broke them first..He claims an open marriage is the solution to their childless marriage and that it's to protect her own interests. But all Braelyn sees is a prison built from guilt and lies.One heartbroken night, she stumbles into a karaoke bar and into the arms of Lucien. A man shrouded in mystery, rebellion and danger. His very presence tells her to run but it also gives her the solace she craved.She never expected to see him again after she ran, forgetting his sinful existence, but life wasn't done making a joke out of her.Lucien isn't just any man, but one who can destroy everything she believes in. The man she was never meant to meet. Her husband's uncleThe black sheep of the Volkov dynasty. A man whose desire will ruin her. Lucien knows she can't be his, but he was never a man who respected social norms. He doesn't care about anything but her every sin and touch.All he wants… is her, no matter how sinful it gets.