The Gyokuei Shui (玉栄拾遺), written by Hagiwara Nobuyuki, a retainer of Yagyū domain, in 1753 mentions that "According to tradition, Shume was the blood of Joseon".
[1] Furthermore, a Korean retainer of Yagyū, speculated to be Shune, was mentioned in Mimibukuro(耳嚢), an essay and kaidan written by Negishi Jin'e in the late 18th century.
[2] According to this source, Takuan Sōhō visited the mansion of Yagyū Munenori, and he found that a Ge (Japanese version of Gatha) hung at the guardhouse.
[1] According to the Gyokuei Shui, Shume was a retainer of the Yagyū clan and married the sister of Toshitoshi through the efforts of Munenori.
Toshitoshi was the son of Munenori's elder brother, Toshikatsu and believed himself to be the true successor of the Yagyū clan.