Upgrade the Cave to Cultivate Immortality and Achieve Immortality

Chen Lin is reborn again Why do you say again? Because this is not the first time I have been reborn Isn't this nonsense? Why is Chen Lin reborn? What secrets does a book of stealing the sky contain? Why is my system upgrade so expensive? What is the connection between the two rebirths? Let's take a look at the path that ordinary Chen Tianzun is looking for