Is there really an expert in China who can count shackles to ward off evil spirits and treat diseases?

Yes, there is, but you can hardly see it in street stalls.

Moreover, it is true that the master does not easily find others. After all, secrets can't be revealed.

If you really want to see it, you can go to a temple or something. I know several people who live in seclusion there, but none of them are in Beijing.