MTL - The Roots of Manga - v2 Chapter 282 sin

Transmigrated to a wizarding world.'But... what about the promise of wizards pursuing truth?''Why is it just a bunch of greedy people who seek power!'...Passing guests, please come in and take a look; if it's not the right fit, then feel free to leave.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Lu Xing zhi’s 18th birthday gift was a handsome, wealthy fiance. Since then, the little lonely orphan girl turned directly into Ms. Rich Perfect and embarked on the pinnacle of her life.

After getting over a scumbag, she was drowning in a pampered happy life.

She merely wanted to hold tightly onto this golden thigh, instead of being left gnawed to the bone by that scumbag.

Huo Jinchen: “It’s my first time. Don’t let me down.”

Lu Xingzhi: “Old man, don’t be so shameless.”

Huo Jinchen: “This old man loves you dearly. Good girl, let your husband love you dearly.”

Huo Jinchen in the eyes of other: honorable and elegant, clean-living and honest, and a modest gentleman.

In the eyes of Lu Xingzhi: A black bellied old man.

“All right, I’ll give you all you want, but you must never leave me.”

Lu Xingzhi nodded resolutely. This uncle has the money, the looks, a ravishing figure, and was so good to her. She would never leave unless she has a hole in her brain.

“What are you doing with your clothes off?”

“Seduce you.”

Love her and love her deeply. It’s an essential homework for Huo Jinchen with Lu Xingzhi.

- Description from Novelupdates

After a shocking reincarnation, our hero opens her eyes to a new (and messy) world the last thing she remembers is reading Lady Viper’s Vow, a dark fantasy novel about a cruel, misunderstood villainess and her path of doom. But when our protagonist finds herself reborn right in the heart of an attack, she’s moments away from a second, way-too-soon death. Just as she’s about to face the end, a mysterious “system” pops up with a single mission: Level Up or Die Trying. It’s bossy, snarky, and her new best friend. As she levels up into a borderline-cheater powerhouse, she discovers her fate isn’t to be a hero, a princess, or even a sorceress, but to protect the one person no one ever expected her to side with: the villainess herself.