The story in this article takes place in the Song Dynasty in a parallel time and space and has nothing to do with real history.
The son of a military commander traveled through time. As soon as he activated the system, he was told that the emperor suspected that the Zhao family was ambitious and had to pretend to be stupid to save his life.
So Zhao Lin began his ten-year career as an "idiot" - being laughed at in court and pitied at home.
Until the day when the Jin soldiers went south, he "accidentally" drew a perfect defense map in front of the civil and military officials of the court.
Emperor: Did you act? Zhao Lin: Guess. ☺️