Originally, Munjangdae(문장대, 文藏臺) was called Unjangdae(운장대, 雲藏臺) because of a big peak rises high into sky and is hidden in the cloud. One day, while King Sejo of Joseon took a rest and recuperation in Songnisan, a young nobleman appeared in his dream and said If you climb into the sacred peak and pray there, your body will be improved. According to his words, King Sejo visited the peak and found the book describing the three moral rules to practice five human relations on the top. He read the book all day long on the spot. It was called Munjangdae after that.