“We must come back alive” Jin-tae (Jang Dong-gun), who works hard to take responsibility for his family's livelihood, is brave even in difficult circumstances to marry his fiancee 'Young-shin' (Lee Eun-joo) and for his younger brother, Jin-seok (Won Bin), whom he cherishes the most in the world. live a good life
One day in June 1950, an affidavit that war broke out on the Korean Peninsula is distributed, and the two brothers are suddenly driven to the battlefield from their peaceful daily lives. 'Jin-tae' and 'Jin-seok' were put into actual combat as the defense line of the Nakdong River, the last stronghold of the ROK Army, without even having time to receive training. 'Jin-tae', assigned to the same platoon with his younger brother, meets the battalion commander to release his younger brother, who is still a student, and feels what is the best thing he has to do for his younger brother's discharge.
And for the sake of his brother's survival, he takes up a gun and sets himself as a hero. A fateful trap awaits the two brothers…
