Time can be stopped, at the cost of the caster's attendant; Time can be reversed at the expense of the caster's future time. - Supreme Mage? Li Fei. The story of a Doctor Strange from Erdu, who is in charge of Hogwarts. No system, no blackening; Don't engage in superbrain, don't be superstitious about science; The key doesn't look tired, the protagonist doesn't have so many dark flies and dogs, and the meaning of Li Fei's coming to this magical world is to explore the satisfaction that magical power brings us. PS: The author is a 10-year-old bookworm at the starting point, and the high V for many years has not been written with an outline full of heads, so many angles of other themes have been written first, the first book, I hope you will support it.