I opened a store, how come all my customers became immortals?

The plane where Tianchen Continent is located was originally a world of martial artists. After a shop suddenly arrived, it began to change slowly. In this shop, there are items that this world is eager to get, and there are facilities that allow martial artists to improve their realm. Slowly, the spiritual energy of this world has become the spiritual energy suitable for cultivating immortals. In the shop, there are also spiritual roots, bones, and immortal cultivation techniques. With the help of the system, the owner of the shop, Yang Feng, created three realms for cultivating immortals in this space plane. Let the customers of the shop become immortal immortals one after another. However, after Yang Feng thought he had created the three realms, he found that it was not that simple. An unprecedented crisis was waiting for him.