During the Korean War, Second Lieutenant Sang-Yeol encounters a group of orphans while leading his platoon. Empathizing with their pain, he makes a choir with the children to protect them.

Second Lieutenant Han Sang-Yeok (Si Wan) leads his platoon during the Korean War in the early 1950s. During the war, Sang-yeok encounters a children's choir who have lost everything due to the war. Emphasising with their plight, he tries to protect the children.