A plane crash traps intern doctor Sun Chengwu in the minus-fifty-degree Arctic. He saves Su Wanqing, preemptively gathering warm clothing, food, and fuel, but discovers survivors turning on each other to fight for supplies. After the ice floes break apart, Sun Chengwu, Lin Can, Huang Shi, and others escape to land, relying on fishing, hunting, and self-made tools to build a shelter. Blizzards, fierce beasts, and diseases arrive one after another, and the scramble for resources and betrayal push everyone toward the edge of human nature. Through repeated life-and-death choices, they struggle to survive and rediscover the value of trust and cooperation.