The talented girl Qin Ruoyan guards the border with her father and meets the school captain Zhao Ce. Zhao Ce guards the border, while Ruoyan sews clothes for the soldiers and writes letters home. The two support each other in a difficult environment. When the enemy invaded, Zhao Ce led his troops to fight, and Ruoyan defended the city to support him. After the war, Zhao Ce proposed to Ruoyan. Under the moonlight at the border, the two made a promise.
