There is such a person. If you want to contact him, I can ask for it for you. Because my master is an old-timer in Nanjing.

But if it is as LZ said, then I think it is immoral.

If you make a reservation first, and have negotiated the price and related contents, but in the end you ruin your business because of a higher price, it is his fault. In any case, you must do what you promised others.