The snowy region serves as writing paper, and the wind and snow serve as writing brush.
A letter that has not been sent, a return date that cannot be waited for.
The boy guarding the border and his southern moonlight.
Purpose: From the perspective of border guards, it describes the intertwining of the mission of family and country and life and death, showing the perseverance and sacrifice of soldiers, and paying tribute to the unknown heroes on the snowy plateau.