According to the Koryu-sah in Koryusaegay, the scholar Kim, Kwan during the 18th year of Eui-jong, wrote a book called Pyunnyuntongrok, which renders an account for the legitimacy of the leader, Wang Gun, who later set up a new nation. A wise man called Dohsun came to Kokryung (old name for Kaesung) and prophesied "This piece of land comes from Mt. baekdu and is the source of the waters andtrees, and will produce an extraordinary male child this year. He shall be called Wang Gun." The same story is found in Cheelee-ji of Saejongshilrokquoting Jookwanyookick written by Kim Kuyoung during the 31st king of Kohryu.

 Koryu was founded in 918 and expanded into Neo-Samkook. However, in the wake of the fall of Palhae in 926,the northern kingdom was captured by the Malgal tribe andit never been recovered. Therefore Mt. baekdu is not an official territory of Kotyu. Mt. baekdu finally lost its geopolitical significance during the Chosun dynasty when the political border line along the was established along Aploke river and the Doomanriver. Nevertheless, the fact that the scholars of the mid to late Koryu dynasty justified the founder, Wang Gun's birth sanctity with regards to Mt. baekdu, indicates the nationalistic pride in succeeding Kokuryu and shows their willingness and duty to recover the lost land. The effort to recapture the lost land continues. One of the evidences is that books like Koryu-sah and Cheelee-ji of Saejongshilrok, which support the view about Wang Gun's birth, were published during the Chosun era.