The Crown Prince Did Nothing Wrong - S1.E28

Byeong Joo set up a treason case, accusing the son and grandson of two Disciples officials of plotting against the king. The Crown Prince visits 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 Jin Heon intervenes.