Job Recruitment Website - Ranking of immigration countries - How to prove that the Japanese with high literacy are mainly immigrants from China and the Korean Peninsula and their descendants?

How to prove that the Japanese with high literacy are mainly immigrants from China and the Korean Peninsula and their descendants?

There are eight overseas students in Japan, seven of whom are descendants of the so-called naturalized Han Chinese, and the other is Silla. This fully shows that the Japanese with high cultural literacy in this period were mainly immigrants from China and the Korean Peninsula and their descendants.