She was originally a rain master, Chi You's rain master. During that war, she fell into the underworld and was never recovered.
But because of a joke from Ksitigarbha Bodhisattva, he returned to heaven, just to repay his debt.
Did she owe him? Or did he owe her something?
When I find my cause, I realize that it has already produced countless results.
The cycle of cause and effect, where should she go?