All the villains in the book were once my cubs [Interstellar]

Many years ago, Cui Yun had just traveled to the interstellar age, and he created a cram school for teenagers with various problems.Cui Yun taught carefully for several years.One day, Cui Yun suddenly discovered that he had actually time-traveled into a book. In this "Great Interstellar Era", these problematic teenagers happened to be the big villains in it. .Cui Yun thought about his previous education methods - spanking, pinching cheeks, knocking on the head... Then, Cui Yun ran away. [Because it was not set properly when writing, there will be some logic bugs that cannot be modified, readers who mind should be careful. 】Content tags: Qiangqiang travels through time and space┃ Search keywords: Protagonist: Cui Yun┃ Supporting role: Adrian