Being single means, although the boss is awesome, he had to act according to your and my Xia Wan'an's inclinations in the beginning.
At the time when Xia Wan'an was in power, if the boss dared to act up, he would have been executed in minutes, and even as a prince, he couldn't escape the fate of being expelled from Endless.
That's Xia Wan'an's assertiveness; she is seen as the spiritual leader by everyone in the Feixue Legion.
For the Feixue Legion, Xia Wan'an is like a spirit.
As long as she's here, that spirit exists. Even if Zhong Kaiyu paid a great price, the boss wouldn't dare to harbor thoughts of betrayal.
However, later when Xia Wan'an left, she chose to transfer Feixue to the Eight Great King Kongs in order not to revert the shares to the original state before leaving.
But at that time, Xia Wan'an didn't know that her departure actually marked the beginning of the division and decline of Feixue.