Start with a white soul.
Bai woke up in a daze, driven by an inexplicable desire to search for a powerful soul.
Something... Was attracting her.
And those powerful souls are attracted to her all the time.
Because:
"You are the only pure white in this chaotic and dirty world."
The world is dirty and chaotic, and the pure white soul falls to the mortal world to take back everything that belongs to him.
They have their own hidden secrets, showing off their power, and she wants to take everything back, even though she has forgotten everything.
Like her, like her a little more, so that she can get back what belongs to her.
"Don't you like me? But I think you will like me very much."
"Do you like me? But I don't like you."
"Let me think about it again."
Purpose: freedom and equality