The Moon Flows Through the River season 1 episode 14
Episode title: Chapter 14: A Fleeting Memory
The Left State Councilor takes Dal hostage and storms into the palace with his private army. He threatens Gang to bring Queen Jangjeong. Gang has no time to hesitate as Dal is in danger. After the Left State Councilor’s crimes are revealed, U Hui gets imprisoned, and when Un comes to rescue, she refuses to leave.
