Seong Hon (Korean: 성혼; Hanja: 成渾; 25 June 1535 – 6 June 1598) was a Korean philosopher, poet, and politician during the Joseon period.
He was a Neo-Confucianist scholar who was a close friend of the scholar Yi I (Yulgok) and an older contemporary of Yi Hwang (Toegye), leader of the country's "western faction" (seoin 서인, 西人) of the period.
[1] Seong Hon is often referred to by his stylized name of Ugye ("bull valley") and Mugam ("black stone").
He gained eminence not only as a scholar but as a revered politician and reformer, attaining the position of Fourth State Councillor/Vice Prime Minister (Jwachanseong 左贊成) in the Joseon State Council (uijeongbu).
He was the great-grandfather of Yun Jeung through the marriage of his daughter, Lady Seong.