The story begins with the sudden appearance of a blood-red moon in the sky, known as the Red Moon Incident. The remaining survivors are forced to seek refuge in a city protected by high walls. Among the survivors, some exhibit mental mutations. Those unable to control their mutations emit a mental plague, contaminating those around them and posing a significant threat to the remaining humans. To address the source of the contamination, the walled city establishes a special contamination cleanup department, and our protagonist, Lu Xin, is joining it! (Source: Tencent, translated)