There is a heavy fog, and several teenagers disappear mysteriously. How do they survive in the fog? In a foggy city where time and space are constantly changing, can they grasp the rules? In the ordeal of a near-death life, several people developed a deep brotherhood, and they were guided by the belief of never abandoning or giving up. An unexpected change led them to discover a shocking conspiracy. In the confusion, there was actually a mastermind behind the scenes. With their wisdom and courage, several teenagers sought a way back to the real world in a dangerous environment.