After wandering through the desert for days, a bitter warrior named Munsu is lost and unable to continue. His life is unexpectedly saved by Mong Ryong, a young man who dreams of becoming a secret agent for Jushin, a once-great country that was recently destroyed. It is Ryong's goal to save his girlfriend, Chun Hyang, a born fighter held captive by the evil Lord Byun Haku Dou.

Then, from out of nowhere, blood begins trickling from Mong Ryong's chest. He has been fatally wounded by the Sarinjas, a cannibalistic breed of desert goblins. The quick-thinking Munsu convinces these beasts to spare his life, in exchange for the peaceful handover of Ryong's appetising corpse.

Although sceptical of Ryong's motives, Munsu sets out to continue the mission that the young idealist described. Accompanied by an army of ghost troops, unleashed using the powers of Angyo Onshi, Munsu liberates Chun Hyang. After visiting her boyfriend's final resting place, she declares herself Munsu's Sando, or bodyguard, and together they set out on a mission to punish those who stripped Jushin of its original glory.

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