Hello, I want to ask you a question. Is there a difference between Kun and San in Japanese?

San is used between peers. Kun is a top-down ambassador. In Japan, the professor calls you Kun. Kun doesn't mean men. If it is a girl, it may be called Kun. Some Japanese teachers in China may call you san. That's because they respect you. After all, they are in China. The person who addresses you above only refers to men. If you are a woman, you will generally use three regardless of equality or not.

You should be talking about sama, which is more respectful. Generally used for guests or families with strict discipline, such as politicians. It may be used to address parents, but it is not used at other times.