Mysterious fires and killings plague the imperial capital, accompanied by rampant rumors and the presence of sinister, mouse-faced soldiers. All signs seem to point towards hidden secrets of a previous dynasty, now obscured by these strange events. In the midst of this chaos, a mysterious force brings together three vastly different young individuals.
Jing Yifei, a cold and aloof female master from the Jinwu Guard, is tasked with uncovering the truth behind the mouse soldiers. Bai Qi, a disciple of the Jieyi lineage, is sent down from the mountains to join the Jinwu Guard, seeking a young master of mechanisms. However, the boy he seeks, Qin Ming, is entangled in his own schemes of deceit and trickery. As the three characters undergo trials and tribulations, they gradually unveil the truth behind the mysterious fires.