There are some reasons that support why it is Korea¡¯s territory.
Dokdo is located geographically closer to South Korea. Distance between Dokdo and Ulleung Island is about 87.4 km, The distance between Dokdo and okiseom is 157km.
Therefore Dokdo belongs to the Ulleung County land. The Korean Empire, Joseon declared a sovereignty for Dokdo internationally in 1905. Joseon Dynasty is five years faster than Japan. The Japanese government at that time made Dokdo ownerless land so Japan tried to make Dokdo for Japanese territory after incorporation. But Dokdo is Korean territory since Silla general, Yi Sa-bu of Ulleungdo Island occupied Dokdo.