Penetration of Books: How to Break Through a Door Full of Cannon Fodder

Yu Youran wore a book and tied two golden fingers on the spot. In order to change the fate of a family full of cannon fodder, she chose to use the golden fingers to strengthen herself. She originally wanted to avoid the male and female protagonists, but the system did not allow her to do so. Isn't it just to grab the chance to play the leading role? The vest is ready, I will take this job! What? Are you not allowed to use the opportunity you snatched? Still have to score? This is too much! I know there is no free lunch in the world, but changing the fate of the continent's destruction seems to be quite exciting...