The future Prince of Xiyun is destined to become the king of Xiyun, essentially a ruler of the country, so how can he be with the empress of another nation? When the time comes, how will the two countries of Wufeng and Xiyun be accounted for? Will Wufeng be merged into Xiyun, or Xiyun into Wufeng?
No matter who merges into whom, the citizens of one country will definitely not accept it, feeling that their nation is perfectly fine and wondering why they have to be merged with another.
Su Yi Jing understands this point, so he says, "I understand, but I will try my best to make her give up the throne of Wufeng for me."
"If she's willing to give up her throne for you, she wouldn't have left a letter and departed in the beginning!" Finally, Xiao Changyi is angered.
Compared to Su Yi Jing being with Feng Feiyan, Xiao Changyi would rather his son had never met Feng Feiyan at all.
He's his son, and he doesn't want him to suffer even the slightest grievance!
