Python Evolution

"Am I still alive?" Zhang Lei opened his eyes in confusion. Zhang Lei, who suffered from an incurable disease since childhood, spent most of his family's savings seeking medical treatment, and finally sought death alone, just to improve his family's conditions. Reborn as a snake, comes with its own system. In the previous life, he suffered a lot and had to die for his family. In this life, I must pursue eternity. (Dark text, the protagonist does not transform into a dragon or a human being) (I hope friends who like this book can comment more and make it more lively.)