I Got Married to a Yandere Queen - Chapter 41 - 40 - Black Fire and Crimson Scales

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

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

Seraphina spent her life as an unwanted orphan. At sixteen, the truth unraveled: she was the lost heiress of the powerful Lancaster family, stolen at birth and finally found. For the first time, she thought she’d have a home and a family.But the Lancaster mansion was colder than any orphanage, and her so-called sister made sure her life ended in silence and pain. Shunned by her new siblings and tormented by the one they called “daughter.” She was nothing but an outcast in a house of wealth and secrets.Until cancer took her life.However, death wasn’t the end.Seraphina awakens in her past, at her most broken and helpless moment. But this time, something has changed.She was stripped of her autism but still carried every scar. Seraphina tried to escape her nightmare, only to fall into the hands of a stranger with blood on his fists and secrets in his eyes.He knows her brothers. And this time, they are not letting her suffer alone.She may not believe in family anymore…But they believed in her and were ready to spoil her.

Chu Li was a particle physicist until a freak accident took his life and transmigrated him to a parallel universe – one where he wakes up with inexplicable abilities and finds himself in the running for a job in the imperial palace.