A beautiful town was instantly submerged by a sudden thick fog. Screams were heard in the fog, and people fled in panic. David and his son were trapped in a small town supermarket with many people in the town, waiting for the fog to dissipate. The thick fog did not dissipate as expected, and the people who walked into the thick fog never returned. The thick fog gradually revealed its hideous face. Fear, panic, struggle, sadness, despair... people's spirits were on the verge of collapse. How can we get out of the fog alive? Faced with the almost crazy people in the supermarket and the all-consuming, unknowable fog outside the supermarket, David hugged his son tightly and began the difficult road to survival...