The world is plunged into a "gray fog crisis". An unknown virus transforms humans into unconscious "walking zombies." The survivors need to search for resources in the ruins and fight against mutants. The protagonist Lin Mo accidentally awakens the ability of "time retrieval". Every time he dies, he will go back to the 13 hours before the disaster broke out. However, he finds that every time he restarts the world, subtle changes will occur, and his own memory is gradually being eroded.
