Jaysoon17, I met a couple of Korean college guys who did the Seoul to Yangpyeong ride, I think, a couple of summer ago without clipless peddles or bike lights. My wife and I met them when they were looking for a motel to stay for the night. I suggest that you invest in a good bike light system, if you haven't already, because it gets pretty dark on those mountain roads after dark, and it is a fairly long ride. Those two guys got caught in the mountains after dusk but they continued the ride. I rode up one of the hills earlier that day and I was impressed they rode so far in the dark in those mountains. The ride I took was from a car camping site to almost the top of the mountain (it kept going and going so I stopped after 45 minutes) and coming down was fun except for those slow down strips in the road. Jarring but beautiful.
