Yun Geun-su

This is a Korean name; the family name is Yun.

Leter of Yun Geun-su

Yun Geun-su(윤근수, 尹根壽, 1537–1619) was Korean Joseon Dynastys politicians and Writer, Neo-Confucian scholars. a penname was Woljeong(월정, 月汀), Woiam(외암, 畏菴), courtesy name was Jagoh(자고, 子固).