Secret Door

A 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.

One of the ministers suffers a concussion after begging from the King. King Yeonjo blames it on Lee Sun.

Unsatisfied with the result of the investigation into Heung Bok's death, Crown Prince Sado re-opens the case, personally heading it himself.

Prince Sado succumbs to all evidence painting Heung Bok as a traitor, that is until Ji Dam approaches him with proof to the contrary.

Ji Dam hides out in a brothel while Prince Sado discovers the meaning behind Jung Woon's dying message.