Mystic Nine follows Zhang Qishan (William Chan) as he joins forces with Wu Laogou (Joseph Zeng), alongside Huo Xiangu (Chen Yao) and the other members of the Mystic Nine, when turmoil returns to Changsha. The mysterious disappearance of Unit 401 uncovers a century-old secret. Faced with life-and-death choices, bound by brotherhood, responsibility to their sects, and devotion to their country, they risk everything to protect their home and overcome the crisis