That is what the writer’s at the Marmot’s Hole tried to determine by signing up for an account and testing to see if the Ashley Madison website is legitimate or not:
Now, according to the claims of Christoph Kraemer, director of international relations for Ashley Madison, “. . . Membership is growing quickest in India, South Korea and Japan.” (cite)
When I read about this, I checked and, yes, the site is accessible now from Korea and does offer support in Korean, however, since there are quite a few complaints of this service being fraudulent. Several people I know thought that this site was a typical dating scam setup, where there are fake accounts setup just to drawn in the unsuspecting, so we thought it would be a good idea to test this and to ascertain if previous complaints had any merit and the following is what we found. [Marmot’s Hole]
You can read the rest at the link, but basically they found the site to be misleading with bots posing as women to get people to sign up for accounts. They never did interact with any real women. I think their advice of learning some Korean and just being a pleasant person is much better way to meet people in Korea than depending on a website like Ashley Madison.