Is there a Yin-Yang teacher in China?

Yes, but China doesn't call it that. In fact, the theoretical basis of Yin-Yang teachers originated from the main viewpoints of the theory of Yin-Yang and Five Elements during the Warring States Period, and took China's Book of Changes as a reference for ancient books. Later Taoism actually incorporated this idea as an important part. In fact, China's so-called feng shui masters and street fortune tellers are the same as those of Yin and Yang in theory, but the TV series is just beautified.