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The film is set in early 11th century China during the reign of Emperor Renzong of the Song Dynasty. The emperor neglects state affairs and indulges in personal pleasures, while the government sinks into corruption and war continues to rage on at the borders of the Song Dynasty. The Song Dynasty is being invaded by the armies of the rival state of Western Xia.Yang Zongbao is the last man standing in the Yang clan, a family of generals who have dedicated their lives to defending the Song Dynasty from foreign invaders. He apparently dies in battle tragically when the treacherous Imperial Tutor Pang refuses to send reinforcements to aid him. Yang Zongbao's widowed wife Mu Guiying leads the other widows of the Yang clan into battle to continue the legacy of their husbands

Hyun-sook (Kim Hee-ae) is a widowed single mother who is raising two teenage daughters while working at a big grocery store. One day, her youngest child, 14-year-old Cheon-ji (Kim Hyang-gi) suddenly commits suicide by hanging without even leaving a note. To Hyun-sook and her older daughter Man-ji (Go Ah-sung), Cheon-ji was the sweet child of the family who rarely complained and studied hard, while always trying to comfort her hardworking, often-weary mother. Struggling with guilt and anger, and not knowing why Cheon-ji chose to kill herself, the two women wonder whether there was something they missed or something they could have said or done. Flashbacks of Cheon-ji's past show that she had been the victim of cruel acts of bullying at her middle school, led by Hwa-yeon (Kim Yoo-jung), the prettiest and most popular girl in class whose true callous and manipulative nature hides a tortured soul.

January 1968, 31 members of North Korean Special Unit 124 infiltrated South Korea with the ultimate mission of attacking the Blue House (Presidential Palace in Korea) and assassinating President PARK Chung-hee. When KIM Shin-jo, the only member who was captured alive, was asked "What was the purpose of infiltration?" on a live TV program, he shouted "I came to slit the throat of President PARK Chung-hee!" and made the whole country's blood run cold. At the same time, In-chan escapes the death penalty for being an accessory to a crime when he accepts an unexpected proposal from Jae-hyun, a general at Silmido H.I.D. Project and is transported to Silmido Special Unit. Silmido Special Unit is a unit composed of dysfunctional social outcasts and criminals under the death or life sentences. Sang-pil and Won-hee are also among the members of this unit. When they arrive at the island, Jae-hyun gives them the classified national duty, which is to explode the North Korean presidential palace and behead KIM Il-sung, the North Korean president. It is a retaliatory project. To its all 31 members, it is the ultimate patriotic mission with pride and loyalty; and it is the only chance they have to start a new life that is promised once the mission is successfully accomplished. With their hopes and promising vision, they survive through the most hellish inhumane 'killing' training and are reborn as human armories. They are the human killing machines, with strong comradeship and respect for each other. Finally, the day arrives and they receive an order from the head office to carry out the mission. With their supreme confidence, they depart for the North. However, the project is suddenly revoked and they return to Silmido with much discouragement and stress. After then, the hellish training continues but, there is no more mission. The psychological frustration and physical tolerance start to reach their limits. And soon, the members start to lose their focus and unity. In order to regain complete control of the unit, the head office performs public executions of its own members. Meanwhile in 1970, with growing nationwide peacemaking movement between the North and the South, the government quickly decides to demolish Silmido Special Unit and executes all its members...