On a snowy night at minus forty degrees on Mount Baekdu, Tu Meng graduated and returned home only to find her father mysteriously missing and assassins surrounding the wooden cabin. Relying on the survival skills honed by her father's twenty years of rigorous training, she fights side by side with her father's life-and-death partner Ka Qiusha and the military dog Guo Baorou, laying out sequential traps relying on the secret mountain armory, counter-killing the pursuers all the way through the extreme cold desperate situation, peeling back layer by layer the truth of her father's disappearance, and finally coming to understand the deep paternal love hidden within that rigorous training and silenced for twenty years.