Fifty years ago, there was a legend circulating in the world about Nightmare. No one knows what a nightmare is, whether it is a person, an object or something else. Just mentioning nightmares, some people are surprised, some are greedy and some are afraid... Fifty years later, Qin Qianyan, who was only 23 years old, started traveling around the world alone, but accidentally entered a small village. The chaotic time and space and chaotic memories made him gradually lost, and he fell into a dispute about nightmares.