Yun, a Mujia android sealed within a Tianshu scroll, was discovered by Fu Yin in ruins identified as the workshop of Che Yun from *Xuan-Yuan Sword: The Millennial Destiny*. Crafted 400 years earlier by Che Yun, she exclusively answers summons from individuals who are her reincarnation. Upon activation, Yun transforms into the fox-shaped combat robot Yun-hu to serve as a battle companion. After the Taibai Empire’s assault leaves Fu Ning armless, Yun crafts magnetic prosthetics to restore her mobility. Aligned with the resistance under Xiang Chu, Yun fights alongside Yin against the Taibai Empire. Her powers and Tianshu link connect her to the series’ recurring themes of ancient artifacts and spiritual entities.