12 meters high; 9 meters width, 24 meters long. It looks like something out of Arches National Park, though no cracks. All of the "holds" are built into the design, and there are also features. It was empty when I went there, and sadly, as I just noticed it when going to the adjacent hospital (to discover I had a break in my fibula), I didn't get to try it out. It seemed to have about 20 routes of all levels with a variety of techniques.
Busses 430, 550, 601, 991, 500, 502, B5, B1 (BRT), B2, B0, B3 (BRT), B3. It's just next to Sejong Chungnam National University Hospital. There's parking at the hospital-- free if you're a patient-- but not much other free parking nearby.
It's 360, so some routes will always be in the sun/shade. There are bathrooms near the wall, and amenities in the adjacent hospital. As the signs note, you have to get cleared before climbing (the wall is fenced off), and then there are basic safety concerns: You should be experiences, children should be supervised, safety equipment mandatory, you assume all risks. That said, there is a state-of-the art hospital adjacent!