Missing Crown Prince S01E20 - The Couple's End

Choi Sang Rok gathers the Seoin Faction and Dosung to carry out a coup. Yoon Yi Kyum kidnaps Myung Yoon to have Dosung on his side. Gun gives an order to depose Queen Yoon and kick Prince Dosung out of the palace. The vassals insist on Gun getting married quickly to have an heir, but he doesn't seem satisfied with any bride candidates.