根據(jù)韓戰(zhàn)期間真實(shí)戰(zhàn)改編。1950年6月25日，北韓揮軍越過三八線突襲南韓竦斯三攻陷漢城（今首爾）戰(zhàn)線不斷南進(jìn)。在美及聯(lián)合國軍支援下，韓軍逆勢反擊。美軍揮官麥克亞瑟提出代為「鐵鉻行動(dòng)」的仁登陸計(jì)劃，該計(jì)劃急一支大隊(duì)的兵力從側(cè)阻擊擾敵、聲東擊西通過長沙里切斷北韓的補(bǔ)給線。由于任務(wù)身極其艱鉅，加上南國軍當(dāng)時(shí)兵力薄弱，法抽調(diào)足夠正規(guī)軍支，軍方不得不把這項(xiàng)務(wù)交付給772名學(xué)生兵執(zhí)行，這些學(xué)生兵均年齡只有17歲，僅僅接受了兩星期的軍訓(xùn)練，在毫無實(shí)戰(zhàn)經(jīng)的情況下投身戰(zhàn)場。軍路上固然殺機(jī)重重戰(zhàn)友內(nèi)部也諸多衝突年少氣盛，迸發(fā)出各角力。仁川登陸戰(zhàn)前，長沙里登陸任務(wù)如執(zhí)行，這群徒有一腔血但戰(zhàn)力薄弱的學(xué)生，無可避免地接受命中最殘酷的考驗(yàn)：穿炮火與海浪，浴血長，馀下部隊(duì)身陷敵軍重圍剿，直至彈盡糧，掙扎于陣亡與倖存分界線上…Based on the incredible true story of Jangsari Landing Operation. When North Korea invades South Korea on June 25, 1950, they pushed South Korea and its ally US Army to the southernmost city. U.S. General MacArthur planned Operation Chromite, which would see the joint allied forces to take back a strategic location of Inchon and in order for it to succeed, he needed a small battalion to flank the North Korean army and eliminate their supply line at Jangsari beach.Having lost his family on his retreat away from North Korea before the War, a model student Choi Sung-pil enlists in the army to fight for the South. Ki Ha-ryun is a rebellious youth from the South who volunteers to fight in the war. All of the 772 students and youths are like them who are barely out of school with only 2 weeks of boot camp training. Task force mander Captain Lee Myung-jun knows that it’s a long shot, but he has no choice but to lead them into a crucial mission. Meanwhile, US war correspondent Maggie braves the dangers of the battlefield to report on the war in the frontlines. She feels empathy for the Korean students who must go into battle on behalf of the veteran soldiers for their country, and tries to do what she can on her end to rescue them.With little ammo, scant food supplies and raggedy weapons, can the students successfully carry out their mission and return home safely?