Zhao Tiezhu, leader of the mortar platoon of the Independent Regiment, blew up the regiment command post in anger because the regiment leader Yan Xiuwen secretly withheld ammunition, which led to the destruction of the entire platoon. He was supposed to be shot, but was saved by Yan Xiuwen and became the captain of the death squad. The two tested and used each other in life-and-death missions, but gradually discovered that each had a shocking secret. When the Japanese intelligence officer Bai Jiajia pressed forward step by step, the military commander Liu Laizi secretly monitored, and the underground party nurse Song Xiaoxiao became the only light. Zhao Tiezhu finally found something more important than hatred amidst the artillery fire and betrayal - trust and mission.
