There aren't many Korean restaurants in Pittsburgh, but this is where most of the Koreans in Pittsburgh I know go to get Korean food. The food is a little bit pricy but less expensive than Green Pepper and more authentic than Oiishi Bento. Although I'm not Korean so I can't really say what's authentic or not, it's always full of Koreans and all my international Korean friends like it. My favorite is the seafood pancake and bibimpap. Love the scorched rice at the bottom.
I've been to the Karaoke rooms once. You can rent out a private room, but it gets pricey. They have a range of both Korean and American songs, mostly mainstream music.