Figuring out that the second daughter of the Jiang clan was, in fact, their son and heir - if you look at it by Qinghe standards - when no one else in Yunmeng had yet figured it out caused Nie Mingjue enough of a headache, and it must have given him a bit of a reputation for sticking his nose into other people's business. That must be the reason that Jiang Cheng would come to him of all people after the fall of the Lotus Pier, hand a little too low down on his stomach for the problem to be food poisoning, to ask for advice - or maybe it was only that he had nobody else to turn to.

“Thank you all for coming,” Lan Xichen said, pouring tea for the other three people at the table. “I think you all know why I’ve asked you to gather here today.” “Sure,” Nie Mingjue said, accepting the cup. “Because our younger siblings have decided to join together to become a criminal gang.” “That seems like an unduly harsh way to put it,” Jiang Yanli murmured, inclining her head in thanks to Lan Xichen as she took her own. “After all, they’re helping people, aren’t they?” Wen Qing huffed. “Leverage,” she drawled. “If I ever find out who gave them that idea…!”

During his time rebuilding the Jiang sect and the Lotus Pier from the ground up, Jiang Cheng meets a lot of people. Some of them he keeps. (5+1 Jiang Cheng adopting stray cultivators after the Sunshot Campaign)