There are only 4 routes on this granite rock. The 3 slab routes do have new bolts and anchors, the one crack route has only one bolt (what I could tell from the bottom). Quality of rock seems to be very good and it's about 10-15m high.
Go to Sognisan Mt. and at Songni dong (the little town with the souvenir shops) turn left after the bridge and go ca. 200m straight until you see the parking lot to your right (don't take the one on the left because you will have to pay and you have to walk to the rock. The Rock is behind the little house just 20m above the parking lot.
Gear to Bring
Quickdraws and rope for the 3 sport routes, add some cams and nuts for the trad one. 40m rope should be good enough.
This area makes sense if you like to combine it with a trip to Songnisan national park. Well worth is the 2-3 hour hike up to Sinseondae, the "standing rock". If you are good enough you can try to climb this one, there are 3 rings on the last 2m to the top, the rest is a short crack where you can certainly place some gear. Since there are a lot of rocks in that area I assume that there are other bolted areas, but I did not find any so far.