根據(jù)韓戰(zhàn)期間真戰(zhàn)事改編。1950年6月25日,北韓揮軍越過三線突襲南韓,三攻陷漢城(今首),戰(zhàn)線不斷南。在美軍及聯(lián)合軍支援下,南韓逆勢反擊。美軍揮官麥克亞瑟提代號為「鐵鉻行」的仁川登陸計,該計劃急需一大隊的兵力從側(cè)阻擊擾敵、聲東西,通過長沙里斷北韓軍的補給。由于任務(wù)本身其艱鉅,加上南國軍當(dāng)時兵力薄,無法抽調(diào)足夠規(guī)軍支援,軍方得不把這項任務(wù)付給772名學(xué)生兵執(zhí)行,這些學(xué)兵平均年齡只有17歲,僅僅接受了兩星期的軍事訓(xùn),在毫無實戰(zhàn)經(jīng)的情況下投身戰(zhàn)。行軍路上固然機(jī)重重,戰(zhàn)友內(nèi)也諸多衝突,年氣盛,迸發(fā)出各角力。仁川登陸前夕,長沙里登任務(wù)如期執(zhí)行,群徒有一腔熱血戰(zhàn)力薄弱的學(xué)生,無可避免地接命運中最殘酷的驗:穿越炮火與浪,浴血長灘,下部隊身陷敵軍重圍剿,直至彈糧絕,掙扎于陣與倖存的分界線…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?