Black mist suddenly shrouded the city, strange monsters roamed everywhere, and the city was reduced to an isolated place for survival. After security guard Lu Yuan worked hard to protect a group of survivors, he was ostracized and expelled by the team. Lu Yuan, who had long made preparations, activated the survival system, relied on signing in to harvest supplies and various practical abilities, and built a safe refuge alone. Some survivors saw through the situation and chose to defect to Lu Yuan. Everyone collected supplies together, learned to fight against distorted monsters, uncovered the secrets buried behind the disaster, and also had to deal with the heavy crises brought by mysterious external forces, while everyone desperately searched for the hope of living in a desperate situation.