Career
Kim"s military campaign captured several castles, pushed north, and restored Korean territory, roughly the present-day border between North of Korea and China. Following King Sejong"s death, Grand Prince Suyang"s ill brother, Munjong took the throne but soon died. The crown passed to his 12-year-old son, Danjong.
The new king was too young to rule the nation and all political processes were controlled by then-premier Hwangbo In and General Kim Jongseo.
Han advised Suyang to take over the government in a coup, and in October 1453, he killed Kim Jongseo and his faction, thereby taking the reins of power into his own hands.