To the Love Born in the Lowest Place - Chapter 5

Zavier met Cosmic Consciousness after his death. He was satisfied with every system that Cosmic Consciousness exhibited, so he wanted all of them. Surprisingly, the Cosmic Consciousness obliged him.

Zavier was reborn in an isekai full of magic and alchemy. Now, he had many routes to upgrade. Interestingly, to coordinate these systems, Cosmic Consciousness gave him the gift of being able to duplicate himself. He could clone a finite number of himself to manipulate these systems.

Magus, Alchemist, Mesmer, Tamer, Hunter, Vampire, Werewolf, Dragonknight, Necromancer.....

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By the way, it wouldn't appear NTR or some bullshit harem of courtships. MC of course will have harem but not for cliches.

After his death, Bern awakens 10 years into the past as the third prince of Kailis, the enemy country.

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

Ren Xingliu transmigrated into a world in troubled times, struggled for half of his lifetime, and eventually achieved success and recognition, working as a good general and minister. Then he returned to modern times, when he was just about to graduate from university.Ren Xingliu who had his fill of wind and frost: I’m beat. Simplicity is the way to go.—Ren Xingliu, the ignorant, incompetent, reckless and daring young master of the Ren Family, was about to graduate. Everyone was waiting to watch him turn the Ren Family completely on its head. One with malicious intentions even deliberately introduced him to an honest person without status or background, Bai Juanqiu.Never did he expect Ren Xingliu to be so content with this honest person.Ren Xingliu: He seemed to be someone who could live a carefree life with. Alright, let’s make do with this.Bai Juanqiu had been putting on his honest persona for twenty years, but those people still wouldn’t let him live in peace and went ahead and introduced him to a notorious silk pants. Bai Juanqiu decided to stop pretending.Afterward…Bai Juanqiu: Well, let me just eat my delicious words, because I can keep pretending for two more years.