Mei is the most notorious prisoner in the Ghost Realm. Born when evil spirits devoured one another, she once took the form of a peerlessly beautiful, seductive fiend, but her body was refined away until she became a mass of black mist.
She stole the Purple Firmament Radiance, which had been kept in the Ghost Realm to cleanse the evil thoughts of ghosts and bless all living things, then escaped the realm.
But after the ghost officials forced her to drink a potion that muddled her with the seven emotions and six desires, she became someone who sometimes seemed utterly genuine and unguarded, and sometimes like a demon who killed without blinking.
Then she met Yun Ni, a young man as bright and noble as moonlight. Her remaining years finally found meaning. Little by little, the evil in her was cleansed, and the world filled with warmth and kindness.