Red Mansions: World Explanation

My name is Liu Yu, a prince who has been deprived of his royal status. Relegated to the frontier. Now, I'm facing a problem. The emperor who deprived me of my status as a prince, removed me from the royal family, and demoted me to a commoner, was trapped in the grassland because of his personal conquest. Now I am given a decree to restore my status as a prince and re-register myself as a member of the royal family. And, he canonized me as King Zhongan. When the messenger arrived, I was killing Hu and moving bricks. The most important thing is that when I had just traveled through time and didn't recognize everything about this body, the emperor's messenger was explaining to me the justice of the world. I really want to know, what is the world? Are there any netizens who know? Waiting online, very urgent...