一對命運多舛的兄弟，自幼因家庭因素被迫分開，從此展開了分歧的運命。

多年，兩人都長大成人，哥哥金赫(朱鎮模飾)成了專門走私軍火的幫派老大，而弟弟金哲（金康宇飾）卻是警察。而領導幫派的十年過程中，金赫與李永春(宋承憲飾)成了莫逆之交，兩人時常出生入死、拔刀相助。然而，幫派中一個手下鄭泰明（趙漢善飾）的叛變，卻使得情況風雲變色，週遭頓時草木皆兵。此時，金哲則虎視眈眈著，計劃要將這些幫派份子繩之以法。

血緣的糾葛、道義的兩難，將這四個人的命運，緊緊地綁在一起…。

Brothers stand against one another as enemies Hyuk (Joo Jin-mo) and Chul (Kim Gang-woo). The two brothers have been separated since childhood. Hyuk, the leder, has become the boss of a weapons smuggling gang. Chul has become a policeman. The two brothers, who had cared for each other like no others, confront each other and take aim at each other’s hearts.

Loyalty stronger than blood Hyuk and Young-chun (Song Seung-heon) share 10 years of friendship while leading the gang as the two aces. Their bond is damaged by rival gangster Tae-min (Jo Han-sun), who is fond of playing dirty.

Hyuk wants to escape the gang’s grip, Chul wants to get rid of the gangs altogether, Young-chun wants to reestablish himself. Through deep wounds and misunderstandings, their relationships are tangled together, and when Tae-min plots to take power they are set on a collision course with unexpected destinies.