What is "saheonbu"

Saheonbu(in Hangul:사헌부, in Hanja:司憲府) administered inspections during Goryeo and Joseon dynasty in Korea. The organ inspected Hanyang, the capital and periphery. It has several nicknames. It was also responsible for licensing officials, impeachment and legal inquiries, which also extends to the control of King's relatives. The strongest duty is to directly criticize king's order.

Since the organ took charge of judicial responsibility for officials and the subjects, the ethos was strict.