Set during the Joseon dynasty period, the series follows four people from different walks of life who come together to help Yi Geum, Prince Yeoning (later King Yeongjo) claim the throne and reform the Saheonbu.[5]
A female police detective of the Saheonbu. One of the best female investigators, she has a talent for both martial arts and foreign languages. Later, she enters the palace as a court maid for Queen Dowager Inwon.
A passionate man who seeks justice and aims to protect the weak and the poor. He is preparing for the civil service exam to become a public officer. Later, he becomes an investigator of Saheonbu, and a secret investigator for King Yeongjo.
Portraying himself as a beggar, he controls a network of informants and storytellers who collect information from all around Joseon's capital and influence common people's opinion.
Lee Geung-young as Min Jin-won, the late Queen Inhyeon's brother, a leader of the Noron political faction and one of the most seasoned politicians in Joseon court.
Jung Moon-sung as Yi Tan, Prince Milpung, Crown Prince Sohyeon's direct descendant. He believes that the Joseon throne should be owned by a descendant of Crown Prince Sohyeon. Using all means necessary, he tries to seize the position of Crown Prince and, subsequently, the throne.
Bae Jung-hwa [ko] as Chun Yoon-young / Bok-dan. Dreaming of becoming the Queen of Joseon, she helps Prince Milpung's cause and becomes his partner.
Han Sang-jin as Wi Byung-joo. An investigator of Saheonbu. Coming from a family of Namin (Southerners) political faction, he faces difficulties in his career as investigator, until he aligns himself with Noron political faction, and controls Saheonbu on their behalf.
First script reading took place in December 2018 at SBS Ilsan Production Studios in Goyang, Gyeonggi Province, South Korea.
On March 7, 2019, it was reported that during the filming of the drama, Go Ara ruptured her Anterior talofibular ligament which resulted in her being hospitalised and having to wear a cast.[7][8]
^ abIn order to circumvent Korean laws that prevent commercial breaks in the middle of an episode, what would previously have been aired as single 70 minute episodes are now being repackaged as two 35 minute episodes, with two episodes being shown each night with a commercial break between the two.[1]
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