The Dangerous Plan - S1.E27

Jang Ok Jeong is worried because the King doesn't trust her anymore. So, she decides to poison herself at her own coronation and blame it on the dethroned Queen. She orders her court ladies to poison her. After that, she becomes seriously ill but she later recovers. Dong Yi meanwhile has return to the capital but the guards are on a lookout for her. Dress as a boy, she manages to sneak into the capital and takes a job as a water maid in order to see the King. She sees the King but as soon as she calls him out, she gets caught and dragged away