Set within the Spring and Autumn period, the story is told from the perspective of an orphaned girl, Che Yun (車芸), whose family was framed by a corrupt official and executed. She was spared from execution due to her age, but her legs were amputated as punishment. Che Yun was talented in the art of Mujia - a technique of creating and manipulating constructs of magnets and wooden machinery, which are lightweight yet powerful, with her late grandfather as her inspiration. She fashioned herself wooden prosthetic legs and managed to craft a lifelike and agile wooden fox that can be used in various tasks such as transportation and battle, Yunhu (雲狐), after much effort and coming across rare materials. She was a close friend with Huan Yuanzhi (æ¡“é ä¹‹), whom Che Yun saved from drowning and who assisted her in creating Yunhu with exotic components.