Transformed into Cannon Fodder in Apocalyptic Literature, I Awaken the Killing System

[Cannon fodder counterattack + system + book penetration + apocalypse + no cp + team] Shen Yuan, who had just graduated from college, accidentally slipped into an apocalyptic novel. In the book, she was just the heroine's college roommate. She was a little cannon fodder who only appeared once at the beginning of the book and was devoured by zombies as soon as the apocalypse came. After mustering up the courage to kill the first zombie, Shen Yuan actually awakened the killing system. With a golden finger, Shen Yuan said that she must end the apocalypse and open a way home.