MTL - Chaotic Lightning Cultivation - ~ Section 907 deals with the matter

Zero, a 35-year-old mercenary, after being betrayed by one of his teammates who told his enemy about him. He chooses suicide so that he can kill his enemy and his traitor teammate. After that, he was reincarnated into the world of magic, in the body of an 18-year-old teenager with the same name as him. However, his body does not have mana or the talent for magic. But with the help of the cultivation system, he has unrivaled power in the world and has a harem of beautiful wives.

Cha Yuen, a remarkable cultivator in his previous existence, witnessed the ruthless machinations of the three formidable factions within the Qing-Yun Realm. These malevolent organizations, in their ceaseless pursuit of cultivation resources, had recklessly extinguished the lives of millions, turning once-thriving towns into barren wastelands within the span of a single night. Their nefarious deeds were shrouded in deception, as they would audaciously attribute the towns' downfall to pestilence and natural disasters.

With an iron grip on all cultivation resources and a monopoly over precious practice materials, these factions ruthlessly barred outsiders from embarking on their own cultivation journeys, reserving this privilege solely for their inner circles.

In response to their tyranny, Cha Yuen defiantly declared war against the oppressive triad. He stood alone on the battlefield, confronting insurmountable odds, and ultimately paid the ultimate price for his valiant efforts, perishing in vain. Yet, destiny had other plans for him. Cha Yuen's spirit was reborn within the fragile mortal vessel of a 16-year-old boy. Armed with the profound powers he had honed in his previous life, he resolved to carve a path of bloodshed and retribution, relentlessly battling his way back into the heart of the Qing-Yun Realm.

And so, a new chapter in his saga unfolds, as Cha Yuen embarks on an epic quest for justice and retribution.

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Death is sometimes not the end!
Dead prison!
This is a magical prison. It has the ability to draw the souls of the dead people of the world, and it also enables people to gain the ability of the souls of the dead.
When Qin Song woke up, he was shocked to find that he had come to the world of One Piece, and even more surprised that he found a prison in his body…..

- Description from Uukanshu

agreed. He thought they might just talk, have a few drinks, and that nothing significant would happen. However, she invited him to a hotel, and they spent the night together.The next morning, she told him it was just a one-night stand and that they would probably never meet again. She said goodbye and left. Ronan also decided to treat it like that.The next day, at his college's hosting club, Ronan was given the responsibility of hosting that year's annual function, where they had invited a singer.When Ronan looked up at the singer, he was shocked—it was the same woman he had spent the night with. After checking her history and social media, he formed an impression of her. Every picture she posted was in revealing clothes, bikinis, or almost nude outfits.He concluded that she was just a promiscuous woman, likely driven by lust, and that she had probably chosen to spend the night with him simply because she found him handsome.Understanding this, Ronan decided to focus on his work. That morning, she had made it clear that it was just a one-night stand and nothing more. He would treat it exactly that way and carry out his responsibilities.Protagonist has System---No NTRIt's Harem, with many girls but The Singer is Main Heroine.