Lord Huai was already crowned as the King, and the Crown Prince was not going to be the future King. He might even get eliminated by the new King.
That was what an imperial family was like - a King could have nine sons, but only one was able to make it to the throne. The others were just useless.
The guard continued, "Lord Huai has become the King, and General Liu is defending him. He is also the Head of the Shadow Door who is equally capable as the army of the court. The Crown Prince, it is all settled. We are in a very dangerous situation. We are surrounded by the imperial army, and hidden guards from the Shadow Door have long been watching us. We can't move at all, let alone take the throne!"
" "…"
"The Crown Prince, we need to think about what to do with our life. The King doesn't share the same mother as you, and he has been your enemy. He may want to get rid of us!"
" "…"