 However, when Yejong became king, a minister named Yu Jagwang (유자광, 柳子光) who was jealous of Nam I accused him of treason when he found out that Yejong himself was not fond of Nam I. Yu also involved the Minister Gang Sun (강순, 康純) and initiated a trial witnessed by the King himself.They were found guilty and executed while Yu Ja-gwang was promoted to a high office and given a title of prince.After this incident, there were many cases of Yu accusing ministers who were apparently more prestigious than himself.