If you like a good drink, Korea is going to feel like a welcome homecoming to you. Not only is the stuff both cheap and readily available, but a large part of being a part of the foreigner crowd is getting out and socializing at the many bars, clubs, and... well... anywhere. Korea has no open bottle law, so you can roam the street with a 1.5 liter pitcher of Hite (Korean beer) and nobody will say boo. I wouldn't advise it though. We foreigners already have a bad enough reputation in this country.
Much like the neighboring Japanese, the Koreans have a rich drinking culture to go along with their near suicidal work ethic. But hey, if I worked as hard as the average Korean did - I'd be driven to drink copious amounts of alcohol too. I barely work half as much and I'm already borderline.