In this mysterious space, there are two countries that have been enemies for generations. One country must maintain drought for many years to survive, and the other country relies on water to reproduce for generations. As fate often tricks, the second princess of the dry sand country fell in love with the future king of the water country. In order to pursue true love, so They are willing to be exiled to the reincarnation of the world. He is a grain of sand in her eyes, and she is a drop of water in his heart. Their souls have already been bound to each other at the moment when their fate is entangled. The empty sky echoes the thousand-year-old vow: I don't ask for eternity, I just want you in the reincarnation of the world. ． ． ． ． ．