Twenty-first century high school student Moon Bin Kim lives a parallel life as the son of a warrior family in the thirteenth century, and struggles to learn who he is and why he exists across time and space.
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: 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...