It's fiction. There is no such thing as belonging to several books. Picheng University is an effect of League of Legends city-state Piette Wolf, which can be strengthened and followed infinitely. Each cost 1X gold coins. This city-state is a new way of playing s9. At first, three city-states will be randomly selected, which requires a team system to choose. You can choose to pair up multiple teams with friends, or join hands with partners to compete and participate in the ranking.