Is the shopkeeper Shuibeijin real or not?

It is more reliable, but it does not rule out fakes.

Many people here used to deal with these big exhibition halls. Then he certainly won't encounter the problem of selling fakes, because the exhibition hall can't sell fakes for your three melons and two dates. They are very strict about the quality control of their products. Basically, every batch of products will be sampled before they enter the store and go to the counter, so as to avoid the phenomenon that the precious metal content in the factory is not up to standard due to operational process problems.