The time of this book is nearly thirty years in the future. An old man who has struggled all his life but ended up with nothing is selected by a brain that has already had self-awareness to transform him into a young girl who is not yet 18 years old and sends her back to three years ago. Then she becomes completely unable to accept the mentality and gradually adapts to this new identity. Finally, she completely becomes the girl herself. Of course, during this period, they discover that there is actually a hidden person in the world in country M who has also been A self-aware Intelligent Brain (villain), this Intelligent Brain tried every means to dominate the world. Of course, the girl joined forces with Intelligent Brain and the third Intelligent Brain who had just become self-aware to destroy many of the villain Intelligent Brain's plots. After getting along for a long time, Intelligent Brain's main body fell in love with this very straightforward girl and transformed himself into a real sunshine boy. The same girl was also very attached to Intelligent Brain, which was a bit sweet and a bit sadistic. The ending was probably good.
Purpose: No matter how disappointed you are, you should still have hope. Justice will always win.