At the end of "The Wind and Cloud Dominate the World", a girl named Bu Ting was obviously born. Why did Fengyun 2 become a boy named Yuner?

Because the plot of the TV series has undergone magical changes. Many plots are different from the original.

The first decisive battle in the original book was the battle of Bu Jingyun, which turned Nie Feng into a unicorn demon. The TV series became a unicorn demon.

The result of the war was that Nie Feng and Bu Jingyun fell off the cliff together, and the second dream was double suicide.

Bu Jingyun, however, pushed Nie Feng back because of his self-sacrifice, which accelerated his downfall.

He lost his memory after falling and disappeared for twelve years.

In the meantime, Chen Jian has been with Chu, and their child is Yun Jian.

Buting is the daughter of Bu Jingyun and Zi Ning with amnesia.