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.