Everything Fansu Says About Right and Wrong Is Right

I haven't figured out what's going on. Did my soul enter another body, or did I end up inside some novel? Either way, I was born into a family that produced many great generals, with both parents alive, and I lived a happy, healthy life until the day I arrived. There's absolutely no way I'm the protagonist!!! So if I find the protagonist and help him reach the peak of his life, can I return to my own world? The Cheng family has three stubborn people. The old one is the prime minister, and he insists I become his son-in-law. The young one is a girl, and she insists I become her husband. The big one has a face like ice and hasn't given me a kind look since the day I arrived. What?!!! His icy expression is because he suffered such trauma as a child that he became "facially paralyzed"?!!!