Dong Yi S01E18 - The Queen Dowager Poisoning Scandal

Jang Ok Jeong notices that it is her brother who plotted the plan to poison the Queen Dowager. She is furious but he says that they have to do this if she wants to be the Queen. This make her realize that she has to change from a kind hearted person into a bad person. Then, Dong Yi also notices that it is Jang Ok Jeong who is behind the poisoning of the Queen Dowager. After that, the King hears that the official who has involved in the poisoning scandal has been arrested. They are all waiting for the confession from the official and it is a shocking confession. The official lies to them and says it is the Queen who asked her to poison the Queen Dowager.