MTL - Master of Science and Technology - Chapter 2 : 1 get up and swear

Cain, a vampire Overgod, turns back time to escape a total annihilation, only to awaken back in time where he was bound by a marriage blood pact to three beautiful vampire sisters who share his power and slow his growth.To regain his peak strength and take revenge on the gods who ambushed him, he must escape the bond.He escaped an ambush by the highest gods. Escaping three vampire wives should be easy.But what if all three of his wives can hear all his thoughts? Can they contain this Overgod creature? Can an Overgod such as himself escape this romantic love affair?

Kim Jeongjin, an editor of a publishing company on the brink of closing due to bankruptcy, ends up transmigrating inside a fantasy novel as the incompetent youngest son of a wealthy family.

And here he thought that he should live a rich life in this life…

“Why was I given a high-level skill? Don’t even bother!”

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

Who, in the ancient mythology, held an artifact and killed the first emperor of the human race?

Who, at the beginning of ancient times, closed the gate of the God Realm, Jedi Tiantong?

Who set a lifespan limit of only one hundred and thirty years for the people, and even the Great Emperor was not spared?

Who, turned into a black hand that covers the sky for eternity, shrouded the world?

…

Yang Shou on Earth: “Yes, yes, I did it all, I just want to live.”

- Description from novelbuddy