Jeong-dong in the 『history of Goryo』 but a variety of passing on the domyeong, Ulleung Island to describe a Dongbang Ulleung Island of the umbrella, cancer, or interpret as domyeong the didn't recognize. Often considered to be. However, the inscription「Mureungdo」and「Usan Mureung」suggest that Mureung was also aware of the Eastern Usan island. Mureungdo a one-time appearance at the end of the Goryeo Dynasty, not only represents the expulsion of Ullung Island from the Joseon Dynasty, but it is also said to be tolerant and paired with an Usana. Therefore, the original「2islands for Usan Mureung」 given by Jiriji in Ilwoon(somebody said)should be regarded as a sign based on social perception.