Mr. Zhan's Little Demon is All Grown up - Chapter 41 - : Addicted to Kissing

Ye Qinghan, young master of the powerful Ye Family, gets ostracized when his peerless father meets an unfortunate end. Lacking strength and in a bid to live a Purposeful life, he suffers through the unending ridicule, bullying and torture dealt to him at each turn. However fate is a cruel mistress and offers only pain and misery with no end in sight. Broken, weak and distraught, Ye Qinghan embarks on a journey to usurp the hands of fate and attain strength to protect his own.

“Missus, time to fulfil your duties!” Mu Yuchen demanded as he pulled Xi Xiaye closer with his arms intimately wrapped around her waist.

It was a meticulously planned feast for the powerful. Her fiancé had knelt down on one knee and proposed to her sister instead. Robbed of her right to her inheritance, she was prepared for the Xi family to throw her to the wolves.
As she slipped away from her family that had turned their backs on her, she found him — Mu Yuchen, the low-profile and reserved noble that ruled City Z and led Glory World Corporation.

“Mu Yuchen, let’s get married!” He looked up at her, then suddenly stood up.

“Where are you going?”

“Let’s go. Any later and the civil affairs bureau will be closed.”

- Description from Novelupdates

Alex was just another ordinary gamer—until the day he died. Struck down by a terminal illness, he found solace in his favorite game, a vast fantasy RPG filled with powerful warriors, intricate politics, and world-shaking events. But before he could see the game's ending, fate had other plans.When he opens his eyes again, he’s no longer Alex from Earth. Instead, he’s Alex Dragonheart, a nameless extra in the very game he once played. Not a protagonist. Not even a villain. Just an unknown side character who was fated to die early, forgotten by history.Armed with only half of the game’s knowledge, an unawakened bloodline, and a mysterious sealed skill, Alex is thrown into a brutal world where strength is everything. His beloved younger sister is sick and needs treatment, but his past self had been powerless to save her. Not anymore.Determined to rewrite his fate, Alex will rise through the ranks, manipulate events from the shadows, and seize power that was never meant for him. If fate refuses to acknowledge him, then he’ll carve his own legend—one that even the gods will fear.After all, in a world where only the strong survive, even an extra can become a nightmare.( Okay guys just because there is a system tag does not mean he will get everything handed to him he will have to work hard to attain power because I will make it so )

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.