수락산-4(Suraksan-4)
The so-called Bulsusadobuk (Gangbuk 5san Mountain), which leads to Mt. Bulam, Mt. Surak, Mt. Sapae, Mt. Dobong, and Mt. Bukhan, is recognized as the truth among mountaineers.
Even people who enjoy mountain climbing can complete this course after climbing for about 15 hours, and it is difficult for the general public to complete it because there are many rock walls.