Do the continents and peninsulas often mentioned in Japanese refer to Chinese mainland and the Korean Peninsula?

People lived in Japan in ancient times. Japan was still connected with the mainland at that time. These people arrived in Japan from Chinese mainland via the Korean Peninsula, and others arrived in Japan via Sakhalin Island. Human migration has never been a long-term gradual integration. You have to discuss the problem of ancestors. The ancestors of people all over the world are Africans. ...

80% of Korean ancestors came from YY, a great country. Who has the ability to conduct a large-scale genetic survey nationwide? Most people in the modern northern and southern dynasties are descendants of ethnic minorities in the northeast, not aborigines on the Korean peninsula. There is no comparability at all. There are a large number of Japanese descendants from the Korean Peninsula and Chinese mainland, but 80% of them are absolutely nonsense. Descendants of the Korean Peninsula fled to Japan after Baekje was destroyed, while descendants of Chinese mainland gradually migrated to Japan from the Jin Dynasty to the early Ming Dynasty. ...

Besides, it's ridiculous to take legends seriously. There are no historical records and unearthed cultural relics of the corresponding era to prove that Xu Fu arrived in Japan, and Xu Fu Temple and the like are only mainland immigrants who later came out to claim to be orthodox YY. ...