Just speaking as a foreigner living in South Korean who plays UO...
Before I got here, I really knew nothing about Korean culture. All I knew was some Korean, what the hell Bulgolgi was, about PC Bangs and Bi Rain. When I got here, I was pretty amazed by the culture surrounding gaming.
Any neighborhood you go to, there's a PC Bang (PC Room). These places are really cheap and the computers are excellent for gaming (I myself have gone with friends a couple of times to just relax there and eve played UO in a few). They're generally packed with high school/ college kids. At one point, I had no internet for a month due to a problematic wire and a **** land lady, so I just walked down the street to check emails and surf.
Korea's culture is highly geared around gaming. There are game advertisements everywhere and a lot of the kids use computers better than I can. They have great cellphones that already have video cameras and dictionaries for Korean to English and there a tons of techno markets. I was really surprised but how easy everything is thanks to all the technology here (people drive with the friggin' TV going in the front seat! Crazy and scary!) I've even walked around in Seoul and come upon Starcraft tapings... that is, these celebrities will be sitting in some place like Coex mall or Yongsan Techno Plaza or something and they're being taped playing starcraft and it's put on TV. Yeah, there's a 24 hour star craft channel here. Nooo joke.
Koreans have highly addictive personalities, and they will admit that. It was an observation I made and once got the balls to ask. They love their celebrities. They all love drinking. A good 80%+ of the population smokes. The government has made it illegal for Koreans to go into -most- casinos for that very reason. I only know of two (Gangwon land and one in Jeju-do) in the entire country that Koreans can go into, the rest card. If you're not a foreigner, you're turned away. It's not surprising they're addicted to gaming as much as they all are. I'd almost argue that's why there is such a huge fear mongering for illegal drugs, because if they didn't say how bad it was for you and threaten huge jail sentences, a lot of Koreans would be hooked worse than some of the severe addicts back in the states.
I was surprised to read that there's been a new time restriction put in effect for PC Rooms though, considering it's already a country law that no places of business should allow minors of 18 into their establishments after 10 pm. Or 11 pm. One of the two. I've gone a lot of places around the time cut off and seen high schoolers told to go home. Weird.