Kim Chang Joong and Lee Yi Gyeom meet the king to recommend Prince Yeoning as the Crown Prince. Meanwhile, Park Moon Soo and his colleagues notice that Yeo Ji isn't back after she left to talk to the students. It turns out the assassins sent to kill Prince Yeoning were ordered by Prince Milpoong and not Min Jin Heon. The widowed Queen recommends Prince Yeoning and the king, after some doubt, orders that Prince Yeoning be made Crown Prince.

The Qing are rumored to dealing in human trafficking of girls from Joseon. Yeo Ji is recruited as an undercover investigator on the case. Prince Yeoning is unhappy at Yeo Ji being constantly in danger. Meanwhile Park Moon Soo, as new member of Saheonbu, is trying to endure all the hard training. The palace officials show that they don't acknowledge the Crown Prince by not showing up at the Prince's first morning lecture.