During the late Ming Dynasty, Emperor Chongzhen seeks to restore order by removing the powerful eunuch Wei Zhongxian and his followers. Meanwhile, a legend spreads throughout the martial arts world about the mysterious Azure Dragon Sword. After his father is murdered for possessing the legendary weapon, young swordsman Li Yifei embarks on a dangerous quest for revenge. As he follows the trail of his father's killers, he uncovers a far-reaching conspiracy that threatens the future of the empire.