On February 8, 1417, King Taejong gave the order to evict residents of the "Usan-Muleung" area. Though there is no record of the actual eviction or when it was carried out, there is a short, August 6, 1417 record of Japanese pirates visiting "Usan-Muleung," which suggests that residents of the islands or the Chosun officials sent to evict them saw the pirates. Here is the short record of the incident:
Source: 「太宗實錄」卷 三十四, 太宗 十七年 八月 己丑條
August 6, 1417
왜적이 우산도(于山島)·무릉도(武陵島)에서 도둑질하였다.
Japanese pirates loot Usan and Muleung islands.
The Chinese character record does not actually say that the Japanese stole anything, but I guess that might be implied in the the words "Japanese pirates."
Notice that the above record says that the Japanese looted "Usan-Muleung," which again suggests that the two islands are right next to each other and not 92 kilometers away from each other. Afterall, if one of the two islands had been Dokdo/Takeshima and the other Ulleungdo, then how could witnesses on Ulleungdo have known that the Japanese also looted Dokdo/Takeshima and vice versa? They certainly would not have been able to see it happen. Anyway, what would there have been to loot on Dokdo/Takeshima since it is essentially just a couple of rocks sticking out of the sea? On the other hand, if Usan-Muleung were referring to Ulleungdo and its neighboring island, Jukdo, then residents on both islands would have most likely known that the other had been looted. They could have seen the pirate ships, they could have heard any gunfire, and they could have exchanged information.
Again, the above record seems to disprove the Korean claim that Usan is a reference to Dokdo/Takeshima. Also, notice that Usan once again precedes Muleung, which suggests that Usan is the larger island of Ulleungdo.