With the "Siberian Tiger Special Forces" on the northeastern border as the core, it tells the story of captain Lin Feng and his team members, relying on their ultimate control of the snowy terrain and hard-core tactics, to successively uncover transnational weapons smuggling, polar rescue, anti-terrorism raids and other tasks, and build a "steel defense line" in the ice and snow, interpreting the special warfare spirit of "a tiger roars, and the border is peaceful".
