Mmmm some notes in case:
It's technically illegal to do any AV in Korea, if you follow through some restrictions best you can get is softcore. I have seen hardcore on tv though while I was staying in Seoul a few times, no clue how they allow it, and lazy to look it up lol.
They seem to be getting around this by doing the AV in Japan instead with Korean girls, smart fellas.
I can understand Korean and based on what I've actually listened to in the videos they are speaking Korean, I'm not that good to pick up if they're actually Japanese speaking Korean since i can't tell difference for accents but they are genuinely speaking Korean.
I should note that it's probably harder to pick up on accents since they have the option to study Japanese in high school in Korea.
As for preference into if they're pretty or ugly, isn't that personal preference? I guess some people like how they look.
No one seems to given me any info to where I can purchase these yet but I'm still keeping up on this board.