TIL the theory of Peninsular Japonic. Linguists believe a Japonic language was spoken on central & southern parts of the Korean Peninsula. The language supposedly spread to Japan during the Yayoi period migration, while the remaining Japonic went extinct & got replaced by Koreanic-speakers in Korea.

Read more: https://en.wikipedia.org/wiki/Peninsular_Japonic

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  1. Makes some sense to me but I’m not exactly a trained linguist.

    Korean and Japanese sound fairly similar (but obviously different even to my ear and I can’t speak either, just a bit of one), whereas they both sound completely different from other east Asian languages which tend to have lots of additional sounds and possible syllables.

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