Oh Yeon-seo found out that her mother was dethroned because of Joo Won when they were young.
The SBS "My Sassy Girl - Drama" Gyeon Woo (Joo Won) remembered that he accidentally got Princess Hye Myeong's (Oh Yeon-seo) mother dethroned. Hye Myeong also found out that he was majorly responsible for it.
Everything came out. Gyeon Woo witnessed a friend get murdered. His friend owned a writing class. Gyeon Woo spead rumors because he thought the Queen had done this to hide the fact that she'd been writing to another man.