Flung into a Mongol military slave camp, Moon-Bin endures arduous combat training in order to be part of a Shield Unit, human fodder for enemy arrows. Orphaned, alone and now forced to fight for his oppressors, Moon-Bin descends into savagery, embracing the only philosophy he knows to be true: Kill or be killed. He becomes an animal in war, a feral beast driven only by the compulsion to survive. His brutality catches the eye of a Mongol general, who believes he can mold this enraged youth into a valuable military commander...