In the brutal heat of the Korean War, a South Korean student named Oh Jang-beom Choi Seung-hyun is swept into a volunteer militia that fights to defend a besieged town in Yeongdeok, North Gyeongsang. As the 766th Unit of the Korean People’s Army’s 5th Division overruns the city, Jang-beom is pulled into a breakout squad led by Lt. Kim Jun-Seop, and the two men endure a harrowing escape that ends with a North Korean sniper’s strike and the lieutenant’s bayonet wound. They are rescued by fellow South Koreans and reach a hospital in Pohang, where the guilt of losing his mentor devastates Jang-beom as Lt. Kim dies by his side.
Captain Kang Kim Seung-woo then assigns Jang-beom to lead a newly formed Student Volunteer Forces, tapping into his hard‑won combat experience as one of only a few veterans among the rank‑and‑file. The unit is soon joined by three young criminals led by Ku Kap-jo Kwon Sang-woo, whose reckless spirit and brash confidence test Jang-beom’s shaky authority. Their presence destabilizes morale and, in a reckless moment, the group inadvertently ruins the students’ food supply, heightening the peril they face.
On patrol, the students are lured into an ambush by a KPA sniper, and the losses mount quickly. The mission is overshadowed by fear and fatigue, and the retreat is painful as the regular army remains tied up at the Nakdong River. Captain Kang pleads for relief and resources, but the high command cannot spare men from the critical Pusan front. They offer a narrow concession: Kang can gather vehicles and a small force of South Korean soldiers to aid the school’s defense.
Dal-young, one of the students, is captured by the 766th and interrogated by Major Park Mu-Rang Cha Seung-won. Though Park Hu-rang shows pity, the plan is brutal: if the school raises a white flag, their lives may be spared. The cruel calculus foreshadows the tragedy to come. Kap-jo brutalizes Dal-young and clashes with Jang-beom before deserting with a comrade, Chang-wu, for the Pusan Perimeter. A North Korean supply truck, driven by Chang-wu and Kap-jo, appears stuck in the road and becomes a turning point for the defenders.
With dwindling numbers, the remaining students decide to defend the school with fierce resolve, hoisting the South Korean national flag instead of surrender. Major Park prepares for an all‑out assault, while the defenders brace for impact. The North Koreans suffer devastating casualties in the early stages, but a crucial supply truck arrives, carrying heavy weapons and a renewed push for victory, driven by Chang-wu and Kap-jo.
The siege intensifies under the shadow of a tank, and the 766th presses forward into the school building. Jang-beom and Kap-jo push toward the rooftop, where the last machines‑guns await and the fate of the defense hinges on scarce ammunition. As the hours wear on, Captain Kang and a refreshed South Korean force arrive to turn the tide. They destroy the North Korean tank and begin driving back the invading troops across the school grounds.
On the roof, the climactic exchanges reach their peak. Major Park arrives in person and corners Kap-jo, who fights to the bitter end. Park taunts the defenders as Jang-beom makes a last, desperate move, loading his rifle just as Park fires—and the shot finds its mark. Park is killed in turn by Captain Kang, and Jang-beom collapses from wounds and exhaustion, saved only by the comfort of his leader.
The cost is heartbreakingly high: out of 71 students, 48 die defending the school. The film closes with a poignant flashback: an Army photographer captures a group portrait of the student-soldiers before the regular troops depart for Pusan, and the surviving veterans, older and wiser, silently reflect on what they endured and what they lost.
This story of courage, loyalty, and sacrifice is told with a restrained, human focus that honors both the soldiers’ valor and the heavy cost of war. It presents a layered portrait of leadership under fire, the tensions between idealism and necessity, and the quiet moments of humanity that carry soldiers through the darkest hours. The battle scenes are vivid and disciplined, balancing grueling realism with the emotional weight of a community defending its own future.
