Hello ~ Seeing your request, I have a book to recommend to you right away! 'The City's Monster Immortal Doctor' meets your requirements! The main character was an Immortal Emperor who had been reborn into the school. He wanted to kill all his enemies and crush everything with absolute strength. There was also a school plot! If the protagonist's background is in the military, you don't have to worry. The author will arrange a lot of military plots for you. And according to the feedback from the readers, the main character is also very powerful. I believe you will like it very much.😘 "The City's Evil Fairy Doctor." I hope you like this fairy's recommendation. Muah ~😗