My Wife is Unbeatable in the Whole World, Touch Me If You Dare! - Chapter 3 - : Lifespan Enhancement [Thanks to "Bezos" for the reward]

"There is a thin line between poison and medicine, and I shall make you dance on it!"

He transmigrated and got a system but Lin Feng’s pressure is as big as a mountain.

Jin, a guy with no direction in life, through an unfortunate event gets his hands on a Hitman System. What transpired then was a struggle to escape the eyes of the cops while trying to complete the system’s missions. However, through a series of coincidences, he soon finds out that his parents’ death was not an accident. Read how he uncovers the veil that has obscured the truth from his eyes since childhood and finds out the darkness that hides under this veil. ‍

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