My Regular Customers Are Actually the Liyue Qixing!?

Rumor has it that somewhere in Liyue stands a mysterious tavern, one that only those destined to find it can enter. Lu Qingci, the tavern's owner, is warm and hospitable. Though he often gets some odd customers, he always listens to their troubles and recommends the chicken soup he makes himself. In time, these customers come to respect him greatly, until one day he realizes that all his regulars seem to be big shots!? Ganyu: "Boss Lu is such a kind person. He's always willing to listen to my troubles and talk things through with me." Keqing: "Boss Lu has remarkable insight. His advice always gets straight to the heart of the matter, and I've learned a lot from him." Ningguang: "Boss Lu's talents are beyond anything I've ever seen. I would offer him my entire fortune, if only he'd become my husband." Lu Qingci is flustered by all this praise. Isn't he just making ordinary dishes and occasionally recommending a little heartwarming chicken soup to his customers? How did he suddenly become the life mentor of the Liyue Qixing?! (I'm bad at writing introductions, so please read the story.)