Film, Kore tarihinde yaşanmış gerçek bir olayı anlatıyor  Haziran 1950'de Kuzey ve Güney Kore arasında savaş başlar İçlerinde cinayetten hüküm giymiş Gap Su'nun da bulunduğu, hiçbir askerlik deneyimi olmayan bir grup genç Güney Koreli öğrenci cepheye gönderilir  71 kişiden oluşan bu genç grubun görevi, Kuzey Koreliler'i Nakdong Nehri civarında durdurmaktır.

71: Ateş Altında

Head of the household, 11 year-old Jin-ho lives with his sick mother who gathers and sells fire wood. The one thing Jin-ho is most scared about is his mother dying and being left alone in this world. One day he has an argument with her about his friend and goes to the mountains alone to gather wood. However, he has an accident and loses his way. His mother looks for him everywhere but can't find him. Jin-ho wanders around cold and hunger for several days and manages to come down from the mountains safely. He thought of his loving mother who would be waiting for him at home. But Jin-ho didn't know that everything that happened was just the beginning of unhappiness.