Han languages
The Han languages or Samhan languages were the languages of the Samhan of ancient southern Korea, the confederacies of Mahan, Byeonhan and Jinhan.
They are mentioned in surveys of the peninsula in the 3rd century found in Chinese histories, which also contain lists of placenames, but are otherwise unattested.
There is no consensus about the relationships between these languages and the languages of later kingdoms.
https://en.wikipedia.org/wiki/Han_languages