Bao is headquartered in Zhongyuan District, Zhengzhou City, and works in an office building. It only applies to advance. Many teachers are demobilized soldiers, which can also be found on official website. It is very formal. I checked, and it has been put on file by the public security network. That's it. It's safe, mainly for personal testing. No matter how bad the child is, the teacher is very serious and responsible, and finally gets what he wants, so it is a trustworthy brand.