A modern girl wakes up inside a martial arts novel and finds herself in the body of a servant from the Sichuan Tang family, a clan known for poison and hidden weapons. She believes she is only a low-ranking maid, but her new body draws the attention of major characters, including the Poison King Dang Jung and Namgung Hui. Her peaceful life disappears as she becomes involved with powerful figures and eventually becomes the disciple of Dang Jung, learning both literacy and martial arts. She must now figure out how to survive in a dangerous world filled with rivalry, secrets, and deadly skills.