Originally, Wan Xuan didn't believe it, but her disciple Wen Qinglan insisted that Xu Xiao was a human undercover agent who had secretly released her in Qingmu City.

With doubts in her mind, Wan Xuan found Chen Dahao, who had been defeated by Xu Xiao and had returned to the sect with only his soul.

Considering Xu Xiao's demonstrated strength, it was impossible for Chen Dahao to escape with just his soul, so Wan Xuan used both threats and inducements.

In the end, Chen Dahao had no choice but to quietly reveal Xu Xiao's undercover identity to Wan Xuan, making her fully believe it.