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Japanese are descendants of immigrants and aborigines from China?

According to historical records, Xu Fu lied to Qin Shihuang that he could find the elixir of life. The immortal is on the island. He needs 3000 virgins, seeds and working wheels. Qin Shihuang gave them to him. Finally, Xu Fu disappeared and said that he had gone to Japan.

But there is another saying that Xu Fu took the money and ran away. I don't know where he went.