This is not true. The legend about 500 boys and girls originated from the fact that Qin Shihuang sent Xu Fu to the sea to get the fairy medicine. Some evidence proves that Xu Fu is indeed the ancestor of Japan. The earliest close communication between Japan and China was in the Tang Dynasty. First of all, because Japan decided to learn from China after its defeat in the war against China on the Korean Peninsula, it often sent Tang envoys to learn from China's advanced culture and technology. Japanese aggression against China was caused by the bellicose expansion of ethnic groups in the province and geostrategic factors. The essential factor is China's backwardness, and Chairman Mao's famous saying is true.