This is a story about someone outside the story breaking into a film and television drama to change the plot. In the original "Harry Potter", the poorest Severus Snape will be saved, and the bad boy Draco Malfoy will also change his destiny. If only Harry Potter could defeat Voldemort, his sister could save him. This is not a time travel, it's just that there is an extra person outside the plot. There is no fixed CP, no portable space, no plug-ins, and no cheats.