MTL - Rebirth of the Abandoned Woman: Godly Doctor Taizi Fei - v3 Chapter 2295

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

One morning, after being bound to the system, MC started his routine of always being captured/ attacked by the ML.

A useless prince, yet brimming with kindness and compassion—his smile as warm as sunlight, illuminating this darkened era.But that was merely a mask, hiding the poisonous and mad nature beneath.A monster lurking behind a gentle shell.A system that feeds on stolen Heroines.He will outplay destiny—and rise as the world’s ultimate villain.

Due to a conspiracy, she was brought back from the countryside to marry him as a substitute bride to bring good luck.Ugly and untalented in medicine? Let's see how she magically heals and showcases absolute beauty!The socialites of Bayside, whose faces were swollen from slaps, complained to Mr. Crawford...Wait a minute, her frail husband turned out to be a business tycoon capable of dominating everything. She rushed over to hug his leg, “Husband, weren't you on the verge of being incapable?”He wore an expression as if he was going to devour her, “It seems I must physically show you whether I am capable or not!”