Heaven was in peace and then "yaks" (giants) came and cause trouble. The God then sent Thepsin down to earth to destroy them. That's not the only reason why he sent Thepsin down. The other reason was that there was a king and two queens who were his wives who didn't have any kids, but they were nice people so that's why he decided to sent Thepsin down along with a sharp, circular weapon to protect him. Thepsin was born to the first wife and the weapon was born to the 2nd wife who then had the ability to become human. Thepsin and his little brother named Intarajak were sent to live with 4 wizards in the forest to learn kungfu. The God in heaven sent 2 weapons down to earth for them. The first was a magical bow and arrow which was for Thepsin. The second weapon was for Intarajak which was the sharp, circular weapon (jak). The God also sent at least 10 good fighters to help them on their journey.
Intarajak grew up to protect and help his brother all the time. He loves his brother so much that he's willing to die for him. While on their way back, the God in heaven had an invitation to invite any guy to come and push the cricket snow mountain that was slanted to the side. Anyone who can push it then will get a reward and the reward is a goddess whose perfect in every way. Her outside and inside beauty which every men desires.
(Source: AsianFuse Wiki)