It is certain that one fifth of the Japanese population should be descended from China. It is clearly recorded in the history books that during the Tang Dynasty, Japan was very envious of the prosperity of the Tang Dynasty. Kyoto and Nara in Japan are modeled after the ancient Chang 'an City. Japanese women are proud of marrying the Tang Dynasty. Japanese women often borrow seeds from Jiangsu and Zhejiang. After arriving in Hangzhou, they tried their best to sleep with handsome and knowledgeable men and returned to Japan after getting pregnant. The Japanese at that time.