MTL - The Reader and Protagonist Definitely Have to Be in True Love - Chapter 29

Corporate slave Alexander dies with only one regret—not finishing the fantasy novel in his hands. Fate has a twisted sense of humor when he awakens as Alexander Flamingo, the perverted villain destined to be expelled and killed in that very story!Armed with complete knowledge of the original plot and a mischievous “Harem King System,” Alexander plans to rewrite his fate. No longer the one-dimensional pervert of the novel, he'll use his future knowledge to manipulate heroes, seduce heroines, and rise from disposable villain to the true mastermind of this world.The system grants him power through every relationship he builds—but can this calculating reincarnator use his second chance to avoid his predetermined death and become the ultimate Harem King? One thing's certain: this story won't follow the original script.

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

Monster Fusion: Rise of the Vice Sect LeaderRay Darkheart was cursed forever unable to cultivate, even after reincarnation. No technique, no bloodline, no divine intervention could change his fate. His body rejected all forms of cultivation, leaving him powerless in a world where strength ruled.But fate was not so absolute.One day, he awakened the Monster Fusion System a power unlike any other. By fusing two monsters of the same rank, he could create something far stronger, evolving them beyond their natural limits. Each fusion carried forward enhanced traits, bloodlines, and abilities, forming creatures that defied logic itself.Yet power came at a price.To advance, to unlock the system’s hidden functions, he needed spiritual stones countless, unending spiritual stones. Every ability, every upgrade, every path forward demanded a fortune. Alchemy, formations, talismans, swordsmanship nothing was beyond his reach, as long as he could afford it.Thus, Ray chose the only path left to him.If the world would not grant him strength, he would take it for himself. As the Vice Sect Leader, he would amass wealth, plunder resources, and rob cultivators blind not for greed, but for survival.A powerless man? No.A schemer, a thief, a legend in the making Ray Darkheart would rise.[sect building] [business empire] [disciple cultivation] [comedy] [alchemist] [formation master] [sword dao] [system] [monster fusion] [resource management] [plundering] [strategic growth] [power progression] [cultivation world]

Summary Version 1:

The mysterious boy Ling Chen is saved by a little girl as he lay on the street dying. Years later, he strikes a deal to save this savior-turned sister and enters the virtual world. In a future Earth where advanced warfare has forced nations to settle issues virtually or else suffer the consequences, Ling Chen bursts into the scene and goes from unknown to legend. Yet all is not as it seems, for Ling Chen has a dark past, and there is a greater mystery at hand behind this virtual world.

Summary Version 2:

To save his terminally ill little sister, Ling Chen enters the newly released virtual game world and joins a small gaming studio comprising entirely of women. From now on walking upon his path towards the pinnacle. An ancient, evil item almost forgotten by history, the “Lunar Scourge” helps forge his unsurpassable legend, and causes him to unknowingly step upon a path that is destined to be punished by the heavens, the way of the shura.