To illustrate the complexity of such questions, here's a map of hypothesized haplogroup spread across east asia: https://en.wikipedia.org/wiki/Ryukyuan_people#

To illustrate the complexity of such questions, here's a map of hypothesized haplogroup spread across east asia: https://en.wikipedia.org/wiki/Ryukyuan_people#/media/File:Y-DNA_haplogroup_migration_map_in_East_Asia.png https://en.wikipedia.org/wiki/Ryukyuan_people#/media/File:Y-...