The Flower in Prison Season 1 Episode 7

Ok Nyeo and Tae Soo’s mission to assassinate the envoy and to steal the letter is carried out. However, Yoon Won Hyung has an ulterior motive, which is more important than killing the envoy. When Ok Nyeo barely makes it back to Joseon, she is arrested and requested to admit to all the charges brought against her because she is a spy.