The special judiciary agency is opened to investigate the Crown Prince's involvement in treacherous plottings. Wi Byeong Joo was being interrogated but is released and takes charge of the treason case. Dal Moon is now working for Prince Milpoong. He spreads rumors in the city saying that the Crown Prince isn't the late king's son. Moon Soo and his colleagues find evidence related to Wi Byeong Joo's coverup of Han Jeong Seok's murder.

Wi Byeong Joo set up a treason case, accusing the son and grandson of two Disciples officials for plotting against the king. The Crown Prince visits Min Jin Heon privately and asks him to side with him for the time being instead of supporting Prince Milpoong. The Crown Prince notices that the posts that were put up around the city contain a secret message from Dal Moon. The king decides to question the alleged rebels themselves but Min Jin Heon intervenes.

Prince Yeoning persuades Min Jin Heon to side with him for the moment and stop the special judiciary agency. Meanwhile, Dal Moon turns out to have been secretly supporting the Crown Prince by trying to extract information from Prince Milpoong. The Crown Prince visits Prince Milpoong to help Dal Moon get the decisive information. Park Moon Soo finds evidence for Wi Byeong Joo's murder of Jeong Seok and decides to do a night inspection.