"Your Majesty, the military power controlled by King Liusu is really strong."
"Yes, I have been worried about this matter these days."
"It's better to let the princess marry into Prince Liusu's palace"
"If King Liusu rebels in the future, won't the princess suffer?"
"Your Majesty, have you forgotten how much the princess's guards look like the princess?"
"Well, then let that Lan Niang marry the princess to Liusu Palace."
"Yes"
"Remember to keep this conversation confidential"
If the emperor knew what was going to happen in the future, he would definitely not say this in vain.