This little bar has its own 4 homebrewedbeers: Pilsner, Dark Ale, Weizen and IPA. Just drink the IPA. The other 3 are just too watery. They do have a nice list of imported beers though.
Most likely the best beer selection in seoul as of Aug 2013. You can find better prices if you hunt, but you can get most anything offered in Korea here, and first.