In "Cloud City", a city full of cyberpunk style, ordinary office worker Lin Xiaoyu lives a "social animal" life of two points and one line every day. His only hobby is collecting old cameras from the second-hand market. Until one day, she discovered that the back of a strange man always appeared in the photos she took. What was even weirder was that she began to have the same dream frequently - in the dream, the man stood in a misty forest, stretched out his hand towards her, and spoke a "password" that she could not understand. On the other hand, game designer Gu Yanze has recently fallen into "Mercury Retrograde". Not only does the game he designed frequently have bugs, but he also keeps seeing the silhouette of a girl in reality. The camera in the other person's hand makes him feel inexplicably familiar. At an accidental garage sale, the two met unexpectedly. The photo in Lin Xiaoyu's camera suddenly "came alive". The man in the photo was Gu Yanze, and the old key that fell out of Gu Yanze's pocket was exactly the same as the key in Lin Xiaoyu's dream. As the two people continue to come into contact, they discover that each other's memories seem to have been "spliced". Those missing fragments hide a secret about the "Time and Space Restorer", and their encounter is not a coincidence, but a "call of duty" that spans time and space.
