This is a great crag, and one of the best winter climbing spots in Korea. It is quite popular among the locals on the weekends, but on a weekday you are likely to be alone.
From Gonguptop Rotary in Ulsan you would head towards Mugeodong. Instead of going into Mugeodong you head past the world cup soccer stadium. You continue past an overpass and through an intersection and stay right. Instead of getting onto the freeway you stay right and go past a main bus terminal. After passing the bus terminal you take a right onto a country road. You follow this steep road up all the way until it ends. There will be a large free parking lot. Park and head up the trail. You will hike for about 15 minutes until you hit a stone staircase. At the base of the staircase, to the left is a little climber/animal trail. Take that down. That will put you at that base of the "trad wall" if you continue past the trad wall you will eventually meet a shaman or find his temple. You can choose to go left down the stairs to the lower wall or continue forward to the far wall.