A group of people are cleaning a spotless unknown space. The emergency message about the coming attack of aliens is repeated on the broadcast. a sandstorm soon invades the space as the foreshadow of the arrival of aliens. it drives the people into a shelter. instead of being frightened, the people enjoy the moment, wearing vr goggles and fall into the virtual world. however, one person accidentally discovers a “system vulnerability” on the cctv monitor. she leaves the shelter. the world has become a ruins. she sees a strange bright light from the windows and moves towards it in the heavy smog… do the alien attackers really exist?