Slightly more pricey and slightly higher end than the usual all you can eat (AYCE) Korean BBQ, Oo-kook claims to serve "KOBE Intercoastal Beef," "Black Angus" short rib (galibi), and some other goodies. I doubt it's real Kobe beef, but even then, it's pretty good, as is the marinated galbi.
The lower level is nice and classy and seems a bit... more formal? Upstairs is more homey and wood textures and probably suited to loud rowdy groups like us pigging out on beef tongue, beef brisket, pork belly, and galbi. I think we had the skirt beef and some other stuff too. I don't remember, we were too busy eating, drinking, and exploding...