I am a 5-year-old spy who kidnapped a villain

I lost my parents in childhood and met my end from overwork due to incompetent adults. When I opened my eyes again, I found myself possessed by a character in a novel. Of all things, I was an extra—a spy for a family notorious for cruelty who dies before the protagonist even makes an appearance. My mission was to become the fake daughter of the novel's main villain, Duke Crost. "I can't die in this life just following someone else's orders." Because I know the contents of this novel all too well... "Let's betray Duke Pose and side with Duke Crost!" "I'll find Duke Crost's lost family and stop him from becoming a villain." "And let's ask him to find an ally to protect me from Duke Pose." Of course, overturning the original story will be by no means easy, but in this life, I will find happiness no matter what!