Recently I was on a business trip in Korea and it was quite the experience when driving over there. Red traffic lights don't mean anything, neither do kerbs, road markings or stop signs for that matter. It was like driving in London but without rules. On top of that, of course, we had a Korean GPS which was hugely entertaining but completely useless to us. And to compound matters one step further, the rental company gave us a car with a mere 8km on it and told us to bring it back with no damage. So no pressure then.
Fortunately, most of our commute was between a hotel on the outskirts of Daejeon and a manufacturing plant out near the suburbs. We were able to use the outer ring road most of the time but even that was quite the experience. It's difficult to say this, but Korean drivers make people in Utah look like highly trained police drivers.