A 20-year-old genius died suddenly in the laboratory and was reborn into a primitive world that was still in the wilderness. There is no technology here, but the military is developed. What's interesting is that he actually has all the books in the Dragon Kingdom's handed down library in his mind. He decided to study technology while pursuing immortality. Morality, intelligence, physical education, art and labor develop together!
This book is wonderfully written 👍👍👍