Dong Yi Promotion to Bin Level 1 Concubine - S1.E50

The Queen also asks the King to make Dong Yi a Queen, but Southern and Disciples' factions want Jang Ok Jeong to be the Queen. Now, Prince Yeoning and Crown Prince are becoming friends. The Crown Prince wants to know what is his illness is. So, they sneak into the pharmacy and they finally know what his illness is. Meanwhile, Dong Yi goes to see Jang Ok Jeong and wants a truce with her. Then, as the King announces that Dong Yi will be promoted to a Bin level 1 concubine, Jang Ok Jeong tells Dong Yi that she will accept her offer on the truce. But then, Prince Yeoning finds a strange book in his school bag.