A mysterious plague spreads across the whole nation within days. As if the epidemic wasn't enough, news that Prince Mil Poong and Wi Byung Ju have escaped from their place of exile shocks the whole palace. Dal Moon just begins to collect information that many wells around the nation has been tasting strange lately.

The king visits the patients at Hwarinseo and consoles them. The riot is prevented. Park Moon Soo is pursuing Wi Byeong Joo and finds out that he contacted a guard of the Cheongju armory. The king orders a prescription based on the past Cheongju epidemic and the patients begin to recover. Queen Dowager also recovers from the disease.