The original source map which Gwon Geun did not cite either is usually identified as the one obtained in Japan supposedly in 1401 by Bak Donji (朴敦之), based on an article of the "Sejong Sillok" (the 10th month of 1438). However, this article is obviously wrong because Bak stayed in Japan from 1397 to 1399 as an envoy to the Ōuchi family of western Japan but could never be there in 1401. Japanese scholar Miya Noriko considers that the date was intentionally altered for political reasons (see below).