The most dependable (sarcastic) assassin — Gao Xuan. Developing himself with an inventory of powerful gear. A master of biding his time, backstabbing, and brutalizing weaklings. Don’t love me. Nothing would come out of this. I am an assassin without feelings.

- Description from NovelUpdates

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.