According to their interview with Sungmin and Sooyoung on Chunji...they don't know any Korean outside of Sarang haeyo, annyoung hasaeyo and kamsa hamnida. xD
I'm not sure if you watched it, but they played one of GM's Korean songs on there. I think it was called Thanks To.
Anyway, also, the album is mostly in Thai, except for two songs.
As for performing, I'm not sure what's going to happen.
I read that they didn't get much attention at ASF in Korea, like the fans weren't very enthusiastic to see them, even though they performed well. =\ Maybe the Album will gain them more Korean fans, or at least I hope so.
ohh i'm a little confused. so they're releasing one by one a korean version right? so the song that Sungmin played "Thanks to.." is that from a new album then? it doesn't have the same beat as any of the songs in one by one so i don't think thats a korean version of any of the songs from that album.
oh yeah i heard about Asian Song Festival too. its because alot of the fans were from korea and only kinda came to see, DBSK, FT Island, Super Junior, and other korean singers. they didn't know that many other asian artistes so they didn't cheer for them.
which i find kinda rude. even if they didn't know who they were they could have at least given them some cheers for support. its very nerve wracking to perform in front of millions of people as it is.