Why does the return of The New Pearl also mean that the Swallow changed its name to Xiao Jian, while Wei Zi was never called May or Brother?

The brother-sister relationship between Wei Zi and Yongqi is in sharp contrast with that between Swallow and Xiao Jian. Swallow and Xiao Jian have been brothers and sisters since they met. For me, she was brought up by Xia alone, and she was not loved by Emperor Ama since she was a child. Such a growing environment is bound to be mixed with gossip, which will also have a certain impact on Wei Zi's character. In addition, the weak royal relationship makes it difficult for Wei Zi to be like Swallow and Xiao Jian.