Korean War, winter 1950. In the frozen and snowy area of Changjin Lake, a bloody battle is about to begin between the elite troops of the United States and China.

Sang Yu is so exhausted from trying to stay awake. Every time he closes his eyes, a demon chases and kills him in his dreams. One night Sang realizes he…

The story centers on the Chinese Special Police Unit, from their hard training to their first mission.