Cultivator Bai is a Mid Nascent Soul Cultivator who partook in the duel proposed by the Moulans during the all-out attack by the Moulans on the Heavenly South Region.
She was in seclusion prior to the duel and only decided to come out of seclusion because Master Sunreach enticed her with the prospect of acquiring the Ice Snow Silkworms in exchange for participating in the duel. She accepted this deal.
She cultivates the Snowcloud Arts.
Her interaction with Master Sunreach whilst striking the aforementioned deal seemed to indicate that she had some sort of entanglement with Master Sunreach. It was unknown what sort of past relationship they had.