MTL - Marvel: Starting From the Dimensional Demon God - Chapter 74

After her rebirth, Rita vows not to repeat her past mistakes. This time, her first priority is to stop her brother, who is about to marry into the Lopez family, from participating in the initial game beta test. In her previous life, she was deceived by this scheming brother until her dying breath. It was only at the end that she realized she was merely a villain in a male-oriented novel about a live-in son-in-law, with all the malice and manipulation orchestrated by him behind the scenes. In this life, Rita decides to change the rules of the game. She will stay in the shadows and seize all the opportunities meant for the male and female leads. By participating in the beta test and re-selecting her abilities, she systematically dismantles the protagonists’ advantages, all while making them believe she’s on their side. Rita has no intention of harming innocent people, nor is she a selfless saint. In this game, she works with the authorities for mutual benefit, all to achieve her ultimate goal—becoming the true master of her fate.

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

My name is Chen Huaian, and I’m dying of cancer.In my final days, I became obsessed with a game where you raise a virtual girlfriend.I spent all my savings buying her cultivation manuals and magical artifacts. Though my wallet was empty, I smiled like never before.I always thought it was just a game—until one day, my virtual girlfriend sent me a mystical pill.The next second, the pill materialized in my hand.I… might not have to die after all?——————————————————My name is Li Qingran. I was stripped of my cultivation, had my spiritual roots torn out, and was exiled from my sect, left to die in a broken-down hut.Just as I thought my life was over, I encountered a mysterious benefactor who never showed their face.This enigmatic figure healed my wounds, guided my cultivation, and helped me grow stronger until I became the most powerful sword cultivator in the Cangyun Realm.But the Cangyun Realm is on the brink of collapse. Spiritual energy is drying up, and the path to immortality is fading. Rumors spread that a mighty immortal from the Celestial Realm plans to merge our world with another on the verge of a spiritual resurgence.A great era of chaos is coming.And even immortals may fall.Desperate to find my benefactor, I scour the world for their traces.I will protect them—and become their eternal partner in the Dao!

It’s a story about a man who got transported into a novel and possessed a slum boy. He met a noble girl and served her as a butler for 13 Years. Now the girl has already fallen from her noble life and lives in an abandoned mansion with paralyzed legs. Why did she become like that? Of course because she is the villainess in the novel.