Siheyuan: Banggeng and I are classmates

Important things should be said three times: this book has no system!!! No system!!! No system!!! The construction is not standardized, and the relatives shed tears. The protagonist traveled from a gray man to a child in a courtyard. After traveling to another world, he found that he did not have the system that all travelers should have. How can he walk among the many beasts in the courtyard to lead them to their respective endings? ...