A Secret Royal Inspector is killed by corrupt officials men. The courtiers appeal to king to abolish the royal inspector system, but the king refuses. Hong Da-in (Kwon Nara), a courtesan spies on officials and report to Jang Tae- seung, Chief Secretary. Sung Yi-gyum (Kim Myung-soo) an assistant advisor is caught gambling and as punishment appointed Secret Royal Inspector. Hong Da-in's cover is blown so she is also sent with Yi-gyum to help. Yi-gyum's servant, Park Chun-sam (Lee Yi-kyung) is part of the Secret Royal Inspector's entourage.