Anti Netotare Villian - Chapter 39: Loyal Servent - 4 (R-18)

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

As a cultivation genius who has achieved a new realm every two years since he was a year old, Wang Ling is a near-invincible existence with prowess far beyond his control. But now that he’s sixteen, he faces his greatest battle yet – Senior High School. With one challenge after another popping up, his plans for a low-key high school life seem further and further away…

Paju, the city of hope, peace and madness.And the tale of a mage trapped in a bizarre world.“In his house at R’lyeh, dead Cthulhu waits dreaming.”