At the end of the Ming Dynasty and the beginning of the Qing Dynasty, someone from the Song Dynasty wrote a book called "Tiangong Kaiwu"; then Wu Sangui rebelled against the Qing Dynasty and made great progress. There were rumors in the world that Wu Sangui was helped by this book; several young heroes, either in search of books or for revenge, started their lives in the world and traveled to the ends of the world with their swords.
