The film focuses on the Cheorwon Blockade.In May 1951, the 63rd Army of the Chinese People's Volunteer Army had just ended a month-long operation when it was ordered to station in Cheorwon battlefield and confront 4 divisions of the United Nations Army head-on.The volunteer soldiers fought bloody battles and finally brought the enemy to the negotiating table.

In order to complete the mission, the soldiers of the 189th Division of the 63rd Army broke into pieces and turned themselves into nails, firmly nailed to the position.

On the 1st Battalion's position, Li Xiang (played by Zhu Yilong), the battalion instructor, made a vow not to retreat even one step and to stick to the position.

Under heavy artillery fire, Li Moyin's (Xin Baiqing) family of three reunited on the battlefield. A key and a reunion dinner in the trenches made this small family separated by the war closer.

In order to build better weapons for New China, Wu Benzheng (played by Zhu Yawen), a returning military industry expert, enters the battlefield under the protection of Zhang Xiaoheng (played by Ou Hao).As a guard, Zhang Xiaoheng firmly believed that protecting Wu Benzheng would protect the future of the motherland.

Sun Xing (played by Chen Feiyu) and Yang Sandi (played by Zhang Youhao) also came to Tieyuan.All the soldiers of the 63rd Army worked together to build an unbreakable “Iron Great Wall” on the Cheorwon battlefield!