Take 6 마을버스 (village bus) from 평촌역 (Pyeongchon Station). Get off at stop for 국민체육센터 / Lotte Mart. Turn left and walk up the hill under freeway bridge. Continue straight for about ten minutes, past the art & design school. The rock is visible from sidewalk.
Stone appears pretty high quality. Landings can be protected with two pads or one pad + spotter. If small holds cannot be found, right corner may require a long move to the lip.