If I complain to the industry and commerce, the beauty salon has no business license, no hygiene license and no employee health certificate. Or hang fake pennants, they will all be affected.

The industry and commerce department will not investigate the origin of the banner, because they did not send it. You should also see where Chu Jinqi was sent and where to ask. You can also make a banner outside yourself. It's very simple. If he doesn't have a business license and other relevant documents, he can call the industrial and commercial department to complain that he doesn't have a business license. In this way, the industrial and commercial department will file an investigation after receiving such complaints, and you can also show that your identity should be kept confidential during the complaint process.