Since he was too young to rule, the government of the kingdom fell to the premier, Hwangbo In, and his vice-premier, General Kim Jongseo.
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, who was vice-premier.
This was because when the King Sejo was still a prince, his actions were greatly restricted by his political rivals, Yeonguijeong, Hwangbo In (皇甫仁) and Jwauijeong, Kim Jong-seo (金宗瑞).