A path of flowers for an oriental fantasy villain

After suffering a fever one day, the memories of my past life came back to me. I’m living in the oriental fantasy novel I read in my previous life! I know the story, so I thought there wouldn’t be a big problem, until I realized… My brother, my sweet and kind older brother will become the villain of the novel who enjoys blood and slaughter?! But he doesn’t look like a villain yet. It’s not too late to change the story. I’ll protect you, brother! Let’s forget that Heavenly Demon stuff and lay down a path of flowers for you!