Ni Dingyuan was currently in Fu Ying's hands.
Fu Ying was secretly plotting to get rid of him.
Their original plan was that since they couldn't kill Xue Yan directly, they would let Fu Xu continue to court death according to the plot. If he caused chaos in the world, Xue Yan would unify the world in advance.
Even if he couldn't cause chaos, he had to let Beicheng be destroyed by Xue Yan in advance.
Then, he would let Xue Yan slowly destroy the other countries, and from there, unify the world in advance.