Is it safe to perform in KTV in Changsha?

I have a relative who used to be a beer salesman there or something.

It's really hard to say whether it's safe or not. A place with a large flow of people like this can be said to be a mixed bag of fish and dragons, and everyone has it. If you meet an unreasonable person, you won't provoke him, but he will provoke you.

Suggestion: Keep a low profile, do your job well, be harmonious and pay attention to your tone.