The screenplay is based on the novel Journey written in 2006 by Oh Se-yeong. The background of the action is the 1795 procession organized by King Jeongjo of Joseon for the 60th birthday of his mother, Lady Hyegyeong, that also commemorated the 60th birthday of his deceased father, the Crown Prince Sado. During the eight days period when the Court left the palace for the ceremony, the show introduces several assassination attempts against the King. A first one comes from the Moon In-bang's group, but this plot is used by the Noron Faction to pursue its own agenda, attempting an armed suppression against the Sipa Faction and the King as well. Apart from the fictional elements, a major focus is placed on two historical sources. The Memoirs of Lady Hyegyeong is extensively used during many flashback sequences relative to events that occurred before the death of Crown Prince Sado, while the official documents from the Joseon Royal Library are used for the current events: the Wonhaeng eulmyo jeongni uigwe for the procession itself, and the Hwaseong seongyeokuigwe concerning the Hwaseong Fortress as a whole. This series is often referred as Eight Days, Mystery of Jeongjo Assassination, a misleading translation since King Jeongjo won the 1795 confrontation and only died in 1800.
1762 accusator of Crown Prince Sado, general executed in episode 1.
Shin Dong-hoon as Maksoe
The Cheokseodan pedler.
Kim Seung-hoon as Daedong attendant
Lee Jae-wook as Bae Jeongtae
No Ik-hyun as Han Jangbok
The Daedong spy at Hwaseong Fortress.
Jung Na-on as tavern keeper.
Oh Seo-yeon as Han Mae
Seol Ji-yoon as Cheongyeon Princess
First daughter of Prince Sado and Lady Hyegyeong.
Yoon Young-min as Jeong Bok
The King's Eunuch, brother of Jeong Hugyeom.
Seok Myung-sik as Kim Hanju attendant
Yang Jung-hyun as Munjung
Oh Hyun-shil as Lady-in-waiting of Lady Hyegyeong
Shin Gyung-sun as Lady-in-waiting of King Jeongjo
Byun Yang-ho as Seo Yubang
Gyeonggi Governor, secretly helping the Noron faction.
Son Yung-kwon as Jeong Hugyeom
Princess Hwawan's adopted son.
Han Hyuk-ju as Kim Gwiju
Queen Jeongsun's brother.
Documents about the real-life 1795 procession
The main document of the 1795 procession is an eight-panel screen, the Hwaseonghaenghaengdo byeongpun. Nowadays, three copies of this screen exists: a sepia one, a blue one and a colored one, the King's copy. This last copy can be seen at Samsung Museum of Art Leeum and has been designated as Korean National Treasure 1430 on 15 April 2005.
Map of the Hwaseong Fortress in the 1800 Uigwe.
Artistic license
The Memoirs of Lady Hyegyeong are in fact a collection of four different documents, written at different times, for different audiences. The description of the controversial behavior of Crown Prince Sado occurs in the 1805 Memoir, ten years after the procession, and not in the 1795 Memoir.
In the real Court, the red robe was for the highest ranks, the blue for the intermediate ranks, and green for the lowest ranks. In the series, the blue dress is the uniform of the villains, while the red dress is the uniform of the "good ones". This helps the viewer to identify who's who, but this can also be a POV-시파 joke from the screenwriter.