During the Ming Dynasty one man will request a competition when his weapon is rejected. After a series of fights he is determined to prove his sword is invincible.

Zhan Zhao is a court officer who learns of a plot to assassinate Judge Bao. While on holiday he meets a young man named Bai who turns out to be a woman. Zhan Zhao tries to recruit Bai to help him stop the assassination of Judge Bao.