On the Road of Cultivating Immortality, I Am Actually the Top Material for Walking

Bai Xiao accidentally fell into the water, and when his life was in danger, he suddenly traveled to a place called Linghu City. In this world, he was an inn night watchman. He needed to collect demon souls and bring them to Linghu City in exchange for spiritual water to practice. However, Bai Xiao, who traveled to the place where he killed demons, could not collect demon souls, so he could not exchange for spiritual water to practice. In order to survive, he can only make a living by doing odd jobs in the inn, but he doesn't know that he is the top material for cultivating immortals. No, you really want to use me to cultivate immortals...