Hyun-jun, a musical actor, makes his mind to go abroad for further study. He returns to his hometown where he meets his cousin So-yeon. After getting a taste of the countryside with her, So-yeon makes the unexpected confession that she has loved him for a long time.
Brother's Blood takes place on the mean streets of a city in decay, where a recently released convict begins to take murderous revenge against his childhood friends, whom he believes let him take the fall for a crime they collectively committed. As the bodies start piling up, one of the friends, now a cop, will stop at nothing to put an end to the murderous rampage and to right the many wrongs of their tragically violent past.