The realm of eternity exists in the gap between the human world and another dimension. Everything here is influenced by the thoughts of human society, as well as the phantom beasts created by distorting space. These phantom beasts are called 'mustard', and their hosts are those who possess 'wei' and 'mo'. These hosts have the authority of the Eternal Realm, but they all have to obey the orders of 'Eternity'. The king of this world, the first generation 'Yun Heng', looks like just a girl.
However, 'Yun Heng' mysteriously disappeared, conveying the message that there would be a second generation of 'Heng'...