"We are the few dark angels and light angels in this world who have been allowed to board this ship of happiness by God. But if one day I am kicked off the ship, will you go down with me? Abandon all happiness?"
"I will."
Since then, a new kind of creature has appeared in this world. They are the descendants of the Dark Angel and the Light Angel. Different from other angels, they are called elves, and another name is the Son of the Forbidden.
——Inscription