Homeowner

A terrible apocalypse has begun in the world—during the day, the sun scorched so mercilessly that no one dared go outside, and even looking out the window during the day was impossible. At night, things are a little calmer—many emerge from their shelters for food or water, and some people and "guests" go from house to house at night, asking for shelter.
The protagonist, however, refused to panic and began to survive in this new, harsh world. He gathered all his food and water supplies, found an old gun and kombucha, and his neighbor brought a large case of beer. People began coming to the protagonist, like other homeowners, asking for shelter. The man agreed, as his neighbor had given him advice: never stay home alone. Many people came to him—he let some in and then left them behind, several of whom were taken away by the "ChS" group; he let some in, but, upon discovering signs of "guests," he killed them; and he simply didn't let others into the house.
It's quite easy to identify the "guest" - red eyes, perfectly straight and snow-white teeth and dirt under the nails
A week had already passed since the protagonist's survival in the apocalypse began. Now there was no one else in his house, only a cat that was unlikely to protect him and a gun that was almost out of ammunition. Night had fallen, and the protagonist expected that people and "guests" would come to him again.