Two weeks after the closure of the community, a neighbor in the building where the author lived had an abnormal nucleic acid, and everyone encouraged her to fight for home isolation, helped her contact the neighborhood committee and the property, and launched a WeChat group solitaire to collectively support the neighbor to isolate at home, and at the same time prepared supplies for her to go to the cabin together. In addition to her zeal, righteousness and simple empathy, there is another reason for solidarity with her: cold lips and teeth. Everyone realizes that they could be the next unlucky ones to be chosen.