I only spent a few days in Seoul. I got drunk on Hite Max, soju and some kind of delicious rice wine. Went to some giant market that went on for blocks.
I was in Busan more, but it was for a wedding, so I didn't get to see a whole lot. I found one music store there and all they sold were Top 40 Korean cds. I gave them some of my bands' cds and they were crazy excited because they were in English.