japanese are actually chinese ppl, when the first emperor, Shi Huang Di, instructed his officer to look for the Elixir of Immortality, the officer requested to fill his ship with 500 girls and 500 boys. Then he lari with the 500 boys and girls to Japan and settled there. Then they lived there and mingle with the locals there and become Japanese.

I think that goes the same with Korea too, if not mistaken

TS still dun get it, Mandarin wasn't created by the Manchus!!! Manchus have their own dialects. For instance, Manchus claim that they are from the Aisin Goro clan, aisin goro is their own dialect, and when translated to mandarin, Aisin= jin = gold, goro= clan.