In the "foggy city" where technology and fantasy intersect, Lin Xiaoman, who has just graduated from college and can't find his favorite job, accidentally inherits the "cloud express station" left by his missing grandfather. This seemingly shabby express station hides a shocking secret - it is connected to multiple parallel worlds, and its customers are all "strange people" from different parallel worlds, including a green boy who can control the growth of plants, a sonic girl who can heal others with her voice, and a mysterious mage with an ancient magic scroll. Lin Xiaoman originally wanted to run a courier station stably and earn a living, but in the process of delivering couriers again and again, he met Gu Yan, who was also entangled in the mysteries of the parallel world. In order to find his missing sister, Gu Yan has been pursuing clues related to the parallel world. The two met due to an accident of "wrong express delivery". Since then, they have worked together to deal with various strange express delivery needs, solve the mystery of the connection between parallel worlds, and avoid the pursuit of the mysterious organization "Time and Space Hunters". In the process, Lin Xiaoman gradually discovered that his grandfather's disappearance was no accident. The disappearance of Gu Yan's sister was also closely related to the turmoil in the parallel world, and the fate of the two of them had already been tightly tied together by a conspiracy that spanned time and space.
