As turmoil rises once more in Changsha, Zhang Qishan (William Chan) and Wu Laogou (Joseph Zeng) join forces, teaming up with Huo Xiangu (Chen Yao) and the other members of the Nine Gates to embark on a perilous adventure. The mysterious disappearance of Unit 401 uncovers a world-shaking secret buried for a century. Life-and-death choices, brotherhood, loyalty to their factions, and duty to their country intertwine. The members of the Nine Gates protect their homeland and weather the crisis together with courage and sacrifice.
