80年代美国东部阿巴拉契山区小镇上一段族人杀戮史，人们闭口不提但伤痕从未消弭。族人后裔的少年不经意揭开这段曾试图抹去的历史，才发现惨剧俨然已是梦魇，折磨着后人。
本片根据朝鲜战争中的真人真事演绎而来。 1950年八月，朝鲜人民军攻克汉城，一路南下。韩国方面征召学生入伍，组成“学徒义勇军”顽强抵抗。学徒兵吴张帆（崔胜贤/T.O.P 饰）所在的部队被人民军连连击退，为补充兵员，数十名学徒兵加入战斗序列，其中包括父母被人民军杀害的不良 学生甲赵（权相宇 饰），这些学徒兵组成了一支71人的小队，由吴张帆担任队长率队防卫浦项，而韩国部队则转移至釜山之前最后的防线——洛东江。孤零零的学徒兵小队在一所废弃的学校中布防，他们将要面对的，是朝鲜人民军精锐的766部队，人民军少校朴武郎（车胜元 饰）为完成最高领袖的任务，下令向距离釜山更近的浦项进攻……
Andrea had just turned fifteen when he decided to take his life. He seemed to be a happy teenager, with good grades at school and an excellent relationship with his parents. There seemed to be no explanation for what he did, until his mother accessed his Facebook profile and reconstructed the terrifying bullying and cyberbullying her son was going through at school.
