Did the ancestors of Japanese immigrants come from early China?

It should be, and probably immigrated to the past during the Qin Dynasty. It is said that Qin Shihuang wanted to live forever and wanted elixirs everywhere. A man named Xu Fu has now taken n virgins to Japan. The legend is not necessarily true, but it is true that the ancestors of the Japanese should have come from China. Japanese fake characters are very similar to Chinese characters, which is evidence.