In the martial world, there is a mysterious sect known as Wuyin, where Nie Yinniang is the top martial artist. Her master, Miaohui, assigns her a mission to eliminate a wealthy merchant, but Nie Yinniang soon finds herself drawn into a deeper conspiracy. She crosses paths with Sima Sheng'an, a deputy minister of the Dali Court, and together they begin to uncover hidden truths.