I Actually Wore the Body of a Dead Ghost

At the beginning of the creation of the ancient world, the heaven and the earth were divided. The turbid air is heavy and depressed, lying on the ground; the clear air is light and empty, floating up to the nine heavens. All things on earth are born due to the nourishment of turbid air, so they are also contaminated by it. Their nature has bad roots in troubled times, making it difficult to enter the path of immortality. If you want to step into the gate of immortality, you have to turn turbidity into purity and transcend the mortal body before you can ascend immediately. However, there is a type of monk who spends his whole life practicing hard and has little chance of becoming immortal. They knew full well that there was no hope of ascending to immortality, so when they were on the verge of death, they took a different approach: using secret methods to bury themselves alive in a place rich in turbid air, using their souls as a guide and their corpses as evidence.