Bai Fang naturally referred to Fang Bai.
When Han Xingyu and his entourage left Purple Flame City, Fang Bai had also disguised himself and followed them, preparing to head to the Xuannv Sect to look for the Linghu sisters.
After learning from Zhuge Lian that the Linghu sisters, Qian Jiao and Baimei, were imprisoned by the Xuannv Sect, Fang Bai was quite annoyed and wished he could immediately storm the Xuannv Sect to demand their release.
The Linghu sisters and Fang Bai knew each other in the secular world and had shared their Cultivation Techniques, making them both teachers and friends. Fang Bai, who always valued friendships, naturally could not stand by idly when his friends were in trouble.