Blood Evolution System - Chapter 75: Tale of Varth (1)!

A man was transported to Ancient China and eventually became a servant of a declining household without a male heir. He utilized his wits and modern knowledge to help the household and eventually become trapped in the sea of political turmoils of the period.

- Description from Novelupdates

Ning Yechen used to be the Demon Lord. He singlehandedly took over the Demon Realm and attacked the Heavenly Realm. His name preceded him throughout the Six Realms. He got tired of fighting, so he quietly went into seclusion and became a happy hermit.One night, an Empress from the Heavenly Realm fell into the Mortal Realm after someone drugged her with an aphrodisiac. She inadvertently fell into his room, and they made out. After the deed, the Empress quietly left. Just when he thought he would never see her again, she showed up in front of him ten years later, bringing a child, saying it was his daughter and demanding accountability from him! “She’s your daughter. You have to be responsible for us!” Ning Yechen was stunned!

Seven years ago, after their breakup, he disappeared without a trace.

Chen Lun transmigrated to the year before the game’s public beta, becoming an NPC in the game world. Thus, a new version was born... Steam punk, Mysterious Objects, Church, Shelter, the pathways of the Sequences of the Seven True Gods... He placed his black top hat on his head, standing atop the ruins. Behind him stood the villain bosses from former game versions, the silent Nun Floey, Bloody Painter Noah, Swordsman Antonio, the delusional clown Alec... Chen Lun said, “Players grind monsters, I grind players, it makes perfect sense...” ... Also known as “How to Rationally Use Players as a Sustainable Resource,” “These Bosses Are Really Strong But They Are All My Underlings,” “No Way! So I Can Be A Deity, Too?!”