Jang Ok Jeong's Execution - S1.E55

The Crown Prince is devastated that his mother is going to die and begs the King to change his mind. But the King doesn't change his mind. On the day of her execution, Jang Ok Jeong wants the King to watch her die. The King cries as he watches Jang Ok Jeong drinks the poison. After that, Patriachs' Faction wants Dong Yi to be the Queen and her son to be the Crown Prince but Dong Yi ignores their request. Then, the King makes a new law that forbids concubine from becoming a Queen because of the chaos caused by Jang Ok Jeong. Later, the new Queen arrives and she wants Prince Yeoning to get married.