One million years ago, they were born. They have the same fate but experience completely different growth journeys.
A million years later, they met. She loved "her", but "she" didn't love her, so "she" ran away.
1000 Years later, they meet again. He is no longer completely him, "he" pretends to be "him" in order to find out the truth.
Fate has tied them together. Together, they will protect the world, but apart, they will be destroyed.
She has already chosen him, and how will he choose?