Missing Crown Prince S01 E15

S01E15 The Secret Antidote

After finding out that his grandfather injured Myung Yoon while trying to get her out of the palace, Gun gets infuriated and asks him to go back to Mungyeong. While the Queen Dowager is away from her chambers, Myung Yoon manages to sneak out the book that contains a prescription for the antidote. Meanwhile, Prince Dosung joins hands with the Queen Dowager and declares that he will become the Crown Prince.