The winds of change rise again in Changsha. Zhang Qishan and Wu Laogou join forces, inviting Huo Xiangu and the other members of the Nine Gates to embark on a perilous and mysterious adventure. The bizarre disappearance of the 401st Unit accidentally exposes a shocking secret buried for a century. Danger lurks at every turn, and life-and-death trials come one after another. Amid a succession of deadly perils, brotherhood, sect duties, and the greater good of their country collide and intertwine. The members of the Nine Gates set aside their differences and work together, facing hidden dangers with fervent courage. They are willing to make the ultimate sacrifice, shouldering the responsibility of protecting their homeland and joining hands to overcome one crisis after another.