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In page Lady Saso:

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Claims made by Samguk Yusa (the source material Lady Saso is first mentioned in) is presumed to be the result of Chinese Sinocentrism,[citation needed] aligning with the claims that the Japanese were descended from Xu Fu (徐福), the Xiongnu were descendants of Lü-Gui (履癸王) the last king of Xia (夏) and that the case of Gojoseon (古朝鮮) and Gouwu (句吳) all revolve around China and its cultural significance.