李滉
He was the ideological successor of Yi Hwang and Cho Shik, moral support of South Man Party(남인, 南人) and North Man Party(북인, 北人)s. his master of Heo Mok and Yun Hyu, Yun Seondo, there's Yesong ontroversy(예송논쟁) then polemic of South Man Party's.