Yin-yang teacher used to be a hot job in Japan. The Japanese emperor got spiritual peace and social security from the Yin-Yang teacher, and the Japanese people got the comfort of hard life from the Yin-Yang teacher. In the period of ignorance, the teacher of Yin and Yang was the spiritual pillar of the whole country. Japanese teachers of Yin and Yang originated in China. Although Japan is a representative of the prosperity of Yin and Yang teachers, it gradually declined in China. The real origin of Japan's Yin and Yang theory comes from China's theory of Yin and Yang and Five Elements. The theory of Yin and Yang is a branch of China's ancient philosophy. It represents a two-sided concept, one is change, the other is growth, and the other is mutual tolerance. It is also an accepted law that everything in the world can be generated.
During the Warring States Period in China, a school advocated the theory of Yin-Yang and Five Elements, which was called "Yin-Yang School". At that time, Zou Yan and Zou Xuan of Qi were the main representatives. With the unification of Liuhe by Qin Shihuang, Legalists occupied a dominant position in China, which gradually weakened the distinction between Yin and Yang in China. In the Han Dynasty, hundreds of schools were ousted, and Confucianism was the only one, so that the Yin and Yang families basically died out in China.