Rebecca Barnes
The evidence seems fairly strong that the proto-culture and the majority of the ancestors of Japanese and Korean people originated together near Inner Mongolia, thousands of years ago. This was a separate and distinct culture from the proto-Chinese culture which at the time had already been in existence further south. Of course, there have been both cultural and genetic interactions between Chinese and Korean/Japanese and the later split groups of Koreanic and Japonic people for thousands of years, so these have never been completely separate, isolated populations. But the idea that Japanese and Koreans were “once Chinese” doesn’t really seem to comport with the evidence. Obviously at some time even earlier, however, all three groups likely branched off from a common migration from the west, long ago in prehistory.

有相当强的证据表明,日本人和韩国人的原始文化和大部分祖先起源于几千年前的内蒙古附近。这是一个与当时已经存在于更南方的原始中国文化相分离且独特的文化。当然,中国人与韩国人/日本人之间存在着文化和基因的互动,以及朝鲜语系和日本语系人群的历史交织,因此它们从未完全分离、孤立的群体。但是,认为日本人和韩国人"曾经是中国人"的观点似乎与证据不符。显然,在更早的时候,这三个群体很可能都源自一个共同的来自西方的迁徙,远在史前时期。