Xu Ren was sullen because Cao Zhengning’s description reminded him of a person. That person was Luo Changsong, the master of the Sixth Hospital of Qianyue Xianzong.

"This is my guess. Do you think it may be true?" Cao Zhengning looked at Xu Ren in disbelief. "It’s nothing. I just think you said people might have met each other. You go on to say that I still want to listen to him. When you’re finished, let Liu Huateng tell me about it. […]