What immortal is Master Bai?

Bai Xianzhu was not a Taoist immortal, but a feudal folk immortal. Generally speaking, people worship Bao Jiaxian just like the city god and the land god. A white fairy is a hedgehog. It began to appear in the northeast in the late Ming Dynasty, and now some families in the northeast countryside also have sacrifices, which are usually written on paper and pasted on the wall, or ranked by white immortals made of wooden boards.