Transmigrated as the Protagonist's Useless Brother?!

One moment I'm a nobody, the next I'm trapped in a novel—but not as the hero. I'm his pathetic sidekick brother, destined to watch him charm every beauty, including my wealthy stepsister. The script says I lose everything while he wins it all. But I didn't get a second chance at life just to play the same loser role. If I'm rewriting my fate, I'm starting with the stunning female lead. She was never meant for him anyway.