There was a time when Human, Heaven and Monster worlds co-existed peacefully. This peace was broke when the Monster world leader, Macheonru, tried to conquer the other two, starting “the Great War? a global conflict between these worlds. The War was about to be won by Macheonru, but the glorious hero King Pacheon, thanks to the power of his sword, the Lion Sword, eventually brought the final victory to the Heaven world. After the end of this cruel war, King Pacheon , decided to shatter the powerful sword that allowed him to defeat the Monster world in 4 pieces. Each piece was sent in a different locations:. one piece was buried in the Heaven-world while another one was buried at Budran, in the Human World. The location of the other two pieces was kept secret. Even if the war was ended, the minions of Macheonru were continually trying to cause havoc in the other two worlds. Chungyong , the Great Lord and king of the Human world soon understood that facing them alone would have been impossible. He first went to Chungoong to steal Heaven Lord’s Holy Sword. Then he searched for someone worth to wield it. Amongst thousands of warriors, he chosed Soma.