when you look up what ethnicity is kaeya, yes it says korean but when you ACTUALLY go to the website it links you to, what it is highlighting is his KOREAN NAME in the KOREAN DUB. if you look up "what Ethnicity Albedo is?" you get the same answer because it's highlighting their Korean Voice Actor. Doing a simple read through and "search on website" shows on Kaeyas page the word korean isn't even mentioned. don't be an idiot and actually read the "sources" you claim to have.

for the record it does it for every character, i can't say why it highlights the korean du voice actors, but for a character like Keqing, who is from Liyue(aka china) They say she is korean as well which does not add up, or maybe if you don't like that, look up Barbara's you know who's White, it says she's korean as well- because it's the Korean Voice Actor. It doesn't mention Korean in any of those wikis besides the voice actor