Fairy on Earth

I feel that some places are a bit abrupt. After all, the protagonist has only been in the mountains all year round and has not gained the memory of the original owner. There should be a transition in life After borrowing the corpse, he looks like an ordinary person. There are no traces of the past (mountain ghost). It is like the original owner is not dead yet, but has only lost part of his memory (Only Chapter 15 has been read so far)

Look what I found, a wonderfully written article on cultivating immortals