Call of the Guardian Spirit

There is no system in this article, there is no invincible and exciting article, it is a normal time-travel novel~ A young man travels through another world without any system or plug-ins. To be honest, I am already short of books. It is too difficult to find a good book. Now I am stuck on one or two chapters every day. It is too uncomfortable╥╥, so I decided to write one by myself =^▽^= This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.