Are China, Japan and Korea really "one language, one species"

They must have evolved from the ancient Siberian race, and one of them came to Japan. The biggest feature of this branch of language is that the predicate is behind, but from the similarity between Japanese pronunciation and Chinese pronunciation, we should know that we are probably an ancestor. The Korean nation is too complicated because people have been emigrating there. No matter whether it is Japan or China, whenever there is a war, they will run to him. In the long run, his race is the most mixed.