Once upon a time, there was a leak in the sky and the residents of the sky kingdom sneaked out to the human world. They were known as monsters and gods because they are totally different species. One day, five Ahrangs came to earth by God's will in order to send the sky people back to where they belong. After ever-lasting battles, the sky people were finally gone and never seen again by the world. However, it's rumoured that the legendary Ahrangs remained in the land still in search for sky people.