What does a teacher of Yin and Yang do?

Is a game that originated in China. Yin Shi Yang is a game that originated in China. In the game, Yin and Yang teachers are regarded as fortune tellers and illusionists. They know how to look at stars and faces, and they can also tell directions, know disasters, draw spells and perform illusions. People also realize that invisible forces, such as fate, soul and ghost, have the ability to dominate these things.