The Yayoi have a good claim to having been, at least in part, the same people as the Hakka. Those are the guys whose constant predations into China drove the Chinese to build the Great Wall.
Recalling that the Chinese were literate, and the Hakka were not, neither were the Yayoi when they arrived in Japan.
It's somewhat later (8 centuries in fact) before the first Korean speaking Koreans arrived from Korea.
115 posted on 02/15/2007 5:08:55 PM PST by muawiyah