With no memory of his father, Sung-Hoon (KIM Woo-Bin) was raised and surrounded by gangsters. As he grew up, he fell into a life of crime. Now imprisoned, his only hope for survival is Joon-Seok (YU Oh-Seong), an unexpected role model. Feeling both admiration and jealousy towards charismatic Joon-Seok, a seventeen-year veteran of the penitentiary, Sung-Hoon’s friendship with him blossoms. Later, they find themselves freed from prison and joining Joon-Seok’s gang, where Sung-hoon discovers that his mentor is somehow connected to his father’s death.