Hidden Agenda (노림수, Norimsu) is chapter 13 of the Twelve Nights webtoon.
The chief state councilor reports to the queen mother that the compact was stolen. Ja Gyeom reassures her that, despite losing the compact, they have confirmed that the Crimson Moon is indeed Crown Prince Jin Yeon. In order to secure the power they lost, Ja Gyeom convinces Yeon Lee that a marriage should take place between his daughter with the king. Outside, Hyun Bin overhears their conversation.
Hwi is still thinking about Dan Ah being the girl he met ten years ago. Baek Ho reports to him that the body of the inspector general they sent is found dead by the lake. Suddenly, Hwi sees Dan Ah following Won. They stop over to see the paintings of a famous painter known as Hong. Nam Yang Heon suddenly appears in front of her, but Dan Ah hides from him thanks to Hwi.