After Entering an Apocalypse Novel, I Became the Cannon-Fodder Female Lead

After Lin Xixi died, she transmigrated into an apocalypse novel. The System told her that the only way to return to her original world was to complete missions and keep the main plot on track. Once the world returned to normal, she would be able to go home. Even with the special ability the System gave her, Lin Xixi was still so useless it could make you cry. Just as she thought she’d have to train hard and become strong on her own, she suddenly became ridiculously overpowered. The reason was... The villainess was up to her old tricks again, a transmigrator had suddenly appeared, and they were planning to create the Zombie King ahead of schedule. System: Go kill the Zombie King! Lin Xixi, lying flat and waiting to die: I quit. System: Don’t be afraid. Dad will give you a cheat. Lin Xixi sprang to her feet and clenched her fist. “I’m back in business!” After fighting the Zombie King one-on-one and rescuing the male supporting character, she realized one day that the force of the plot would push the side stories forward. She might not be able to stop the original story’s villainous little sister from being abused, or prevent the birth of the future supervillain. “Then why don’t I take over the villainess’s role?” “If his sister’s going to fall into the villainess’s hands, she might as well fall into mine.” So Lin Xixi took out the villainess and took on both roles herself. [First villainess mission: Join the villain’s faction and tell him, “My dream is to shine for you and give you everything I’ve got!”] Lin Xixi: ? Shi Wen: ? [Kidnap Shi Nuan and provoke Shi Wen.] Shi Nuan, who Lin Xixi brazenly led away through the front gate: ? Lin Xixi put her hands on her hips. “Tell Shi Wen his sister is done for! Want to save her? Maybe in your next life!” The people at the base nodded half-heartedly. Shi Wen, back at the base: ? What’s she up to now? _ A heroine who seems useless but is actually ridiculously overpowered, and a calm, cool guy.