Career
He was Prime Minister or Chief State Councillor from October 1466 to April 1467 and again from January 1469 to August 1469, during the reigns of King Sejo of Joseon and King Yejong of Joseon. His nicknames were "Apgujeong" (압구정, 狎鷗亭), "Apgu" (압구, 狎鷗), and "Saudang" (사우당, 四友堂). He was a tactician and trusted adviser of King Sejo of Joseon and he advised the latter to produce a coup d"état.