My city has become the last pure land in the global apocalypse

Introduction: Gu Yan, who has traveled through 999 different worlds, is about to face the final mission. This is a world that requires her to explore and unlock the progress bar, and now all she needs to do is follow the mission. PS: No CP, the heroine just wants to complete the task and fulfill her wish! This is a novel with a relatively mild tone. Good will be rewarded with good and evil will be rewarded with evil. Good people should have enough food, clothing and warmth to live happily every day~