Tide of Weird Beasts? Don't Worry, Deal with the School Bullying First

[Not cultivating immortality + single female protagonist + city + light group portrait + not brainless + PVE monster hunting (there will be carrots in the later stage)] Also known as: "The Lonely City of Strange Beasts·Lightless Day" 50 years ago, a strange spiritual revival came, and animals and plants mutated one after another. Even most humans were not spared. Under the strange rules, guns are ineffective, weapons are ineffective, poisons are ineffective, and even fists cannot cause damage to the strange beasts. However, in despair, the sun rises! Under the shroud of sunshine and the succession of countless heroes, mankind rebuilt the city and regained a glimmer of hope. However, the great heroes are surrounded by countless cowardly flies. They suck greedily and try to strangle the future of mankind together with the covetous beasts. However, Li Mingzheng, a former professional assassin who traveled through time, will not give up. He can ignore his abilities and will use his life to lead mankind to create a real tomorrow! (Note: The heroine is not a pretentious vase. Although I cannot satisfy everyone, I will try not to make the heroine annoying)