U Hakyu

U Hakyu was the son of U Pangjae [ko] (우방재; 于邦宰), who served as Vice Director of the Right (우복야; 右僕射; u pogya).

U's father told him, "The military officials have seen injustice for too long.

[3][4] The two would instead choose Supreme General Chŏng Chungbu and successful executed the military rebellion in 1170.

[1][5] When Song Yuin, the military-appointed military commissioner (병마사; 兵馬使; pyŏngmasa) of Sŏbungmyŏn (서북면; 西北面), failed to deal with a series of revolts, U, who was then a Grand General in the Kŭmo-wi division, was sent to replace the beleaguered Song Yuin.

At the time of his death, U Hakyu held the position of associate commissioner of the Security Council (동지추밀원사; 同知樞密院事; tongji ch'umirwŏn sa).