Based on the 2001 film, Friend, Our Legend expands and retells Kwak Kyung-taek's semi-autobiographical rough-and-tumble tale about four childhood friends coming of age in the tough streets of Busan in the 1970s and 1980s. As they enter into manhood, best friends Dong-soo and Joon-seok become enemies and bitter rivals in the city's underworld of gangs.