Legionnarrious is the one of a few Korean I found in this site. I know him in another history forum in Korea. Him, me, Swinburne and maybe fox are certainly Korean.
I can talk him. He gave you examples of epitaphs of Korean traiters for Tang. It said they mentioned definition of their origin as Samhan. These epitaphs were founded in Tang period.
Another example is Japanese historical record like Nihonshoki. This books written by that three Kingdoms as Samhan. I remember Legionnarrious said like that and I said you like that. That is enough refutations against your personal insistance, That means contemporary neighbours called Three kingdoms as Samhan. Additionally, your Samhan identity opinion were refuted by both Japanese and Korean scholars, correctly, geneticists and anthropologists. I want to keep this problem in here, But you know these are banning mention of that. So that is all. Just stop it
Second, exonyms are highly conservative, such that earlier terms for countries tend to survive even when those states are gone. The Russians, for example, still use the term Китай Kitay for the PRC, as though China was still the land of Khitans. The Japanese were in contact with the earlier Samhan, so for them to conserve the term Samhan for describing Korea even during the Three Kingdoms period is not at all informative.
Third, genetics is banned on historum because they are frequently used incorrectly to make arguments about history. In this case, the issue is language and identity - genetics are not even relevant.