Upper Musucheon Climbing

Easy approach. Park on the side of the road next to some houses. You will see a lime green gate at the top of an overgrown stone staircase. Follow the stairs down to the river bed, and take a left. You'll follow the riverbed for about 5 minutes before you reach the upper cave area. The Opera House will be on your left as you arrive.

From KotR

Take Highway 95 (West Industrial Highway) southeast out of Jeju City, starting from E-Mart. Follow the road out of the city for 2-3 kilometers until you pass a bridge. Just before the 4 lane road splits and becomes a full fledged 4 lane highway, turn right at a tiny Mom & Pop convenience store tucked in the bushes. The one-lane blacktop road runs between the shop and the riverbed. Follow the road to the back and stay right (don't veer left). The riverbed will always be on your right. After 100 meters or so, you'll see a sharp turn right with guard rails. This is where you can park if you have a vehicle. You'll then see a sign and stairs behind the sign. Take the stairs down into the riverbed, once at the bottom turn left following the stream down. Hike in about 150 meters until the stream jogs left, follow it around and you'll see the concave wall on your left. These are the difficult routes obviously, the easier ones are about 75 meters down stream.