Drug cartels have turned the American continent into a breeding ground for crime. Among them, “Kinalroa” — the largest and most powerful organization — recruits children by any means necessary and raises them as assassins known as “Sicarios.” Lee Se-fa survives the brutal, hellish training to its very end, growing into an elite killer. However, he is ensnared in his boss’s trap and is forced to kill his closest comrades with his own hands — a tragedy he cannot undo. Feeling utterly betrayed, Se-fa tears the organization apart from within, then returns to South Korea — the homeland that abandoned him when he was just a child. But his fleeting taste of a peaceful life is short-lived. Domestic and international criminal forces hunting him down, the ghosts of his past who survived, and the relentless pursuit of law enforcement closing in on all sides — all of it drives him back onto the battlefield. Lee Se-fa, the Sicario, carries a blade of revenge in his heart.But who truly is the “real enemy” that blade must be pointed at…?