Secret DoorSeason 12014 · 24 episodesEpisodes1Episode 1A document, thought long destroyed, tying King Yeongjo's ascension the throne to the Noron Faction, resurfaces. Crown Prince Sado distrupts the government by proclaiming the creation and distribution of books by commoners legal.2Episode 2Heung Bok's body is found and the conspiracy to cover-up his murder begins.3Episode 3Unsatisfied with the result of the investigation into Heung Bok's death, Crown Prince Sado re-opens the case, personally heading it himself.4Episode 4Prince Sado succumbs to all evidence painting Heung Bok as a traitor, that is until Ji Dam approaches him with proof to the contrary.5Episode 5With Ji Dam's help, Prince Sado delves deeper into the conspiracy behind Heung Bok's death.6Episode 6Ji Dam hides out in a brothel while Prince Sado discovers the meaning behind Jung Woon's dying message.7Episode 7Prince Sado seeks out the identity of the man Heung Bok's final royal painting.8Episode 8An investigation into yet another death leads Prince Sado to suspect one of the people he trusts most.9Episode 9Prince Sado is accused of murder.10Episode 10Teacher Park Moon Soo makes a deal to try and save Prince Sado from prison.11Episode 11Prince Sado becomes suspicious of his father's role in the document.12Episode 12King Yeongjo appoints a new Prime Minister and sets out to enact new tax reforms while Prince Sado struggles with what to do about his father.13Episode 13King Yeongjo unleashes his punishment on the booklenders.14Episode 14King Yeongjo strips Prince Sado of all governing power. Three years later, Prince Sado begins a secret plan beginning with taking Kim Taek as his new teacher.15Episode 15In order to get his governing powers back, Prince Sado begins difficult negotiations with the Qing.16Episode 16Kim Taek sets a plan in motion to oust and replace Prince Sado.17Episode 17Prince Sado returns to the regency and sets out to make the country a better place for all classes.18Episode 18King Yeongjo and Prince Sado clash over allowing commoners entrance to the civil service exam.19Episode 19Prince Sado faces the fallout of allowing commoners take the civil service exam.20Episode 20The Noron set a new plan in motion to oust the Crown Prince.21Episode 21On the eve of the new Queen announcement ceremony, the Prince discovers a plot to assassinate the King.22Episode 22The Noron set out to discover why the Prince has been sending funds to the North.23Episode 2324Episode 24
