Royal Secret Inspector is a comic mystery investigative drama. It will tell the story of the secret royal inspector, a position unique to the Joseon Dynasty. Secret royal inspectors were appointed by the king and dispatched incognito to local provinces to hear the peopleŌĆÖs stories and eradicate corruption. Kim Myung Soo plays Sung Yi Gyum, a busuchan (a type of public official) in the Hongmungwan (administrative and research institute of the Joseon Dynasty). He is the kind of person who only lives for the moment without any goal or ambition. But he is actually smart enough to win first place in the civil service examination. After getting caught gambling, he is punished by being forced into the position of secret royal inspector. Kwon Nara will play Hong Da In, a beautiful and spirited gisaeng (Joseon DynastyŌĆÖs courtesan) who is actually a damo (women employed in the palace to work as attendants in various government departments) working undercover. She somehow joins hands with Sung Yi Kyum when he is appointed the secret royal inspector. Lee Yi Kyung will take on the role of Park Choon Sam, Sung Yi KyumŌĆÖs servant. He is a warmhearted and lovable character who talks nonstop and cries a lot but also has a lot of cunning. Lee Tae Hwan plays the role of Sung Yi Beom, Sung Yi GyumŌĆÖs half brother. Being the son born between yangban (an aristocrat) and a servant, he finds himself in an irreversible situation and goes up against his brother. Meanwhile, Royal Secret Inspector Āwill begin filming in earnest after completing all preparations, including the cast lineup. Source (1)