Haechi Temporada 1 Episódio 9

The Crown Prince has become king but does not win respect because of a lack of an heir. He is powerless at court. Meanwhile, Prince Yeoning meets the Minister of Personnel to tell him that Prince Milpoong probably killed Prince Yeonryeong, but the Minister is only interested in solidifying political power. The Patriarchs scheme with prisoners and let them escape, but Prince Yeoning sees through it.