Lin Xiaoman, an ordinary delivery boy who works hard in the "Fog City", rides a small electric donkey through the streets and alleys every day. His biggest dream is to save enough money to open a small noodle restaurant of his own. One day, he received a strange order. The delivery address was a "Cloud Building" that had been abandoned for many years on the edge of the city. The note read, "Trouble is very spicy, and it can be so spicy that the soul can leave the body." He thought it was a prank, but when he delivered it, he met Shen Qingci, a mysterious man wearing ancient clothes and with a cold temperament. From then on, Lin Xiaoman's life completely went astray, and the order notes became more and more outrageous - "Send strawberry cake to the glowing little fox, don't let it eat the wrapping paper" "Send dumplings to the grandfather who lives in the old locust tree, and ask for leek filling, he doesn't eat meat" "Send hot cocoa to the transparent girl on the carousel in the amusement park, she is afraid of the dark." What's even weirder is that every time he delivers these "non-human" orders, there will be a large "tip" in his account, sometimes it's a shiny coin, sometimes it's a sachet that can give people a good night's sleep. And Shen Qingci seemed to always appear when he was in trouble and help him solve problems that ordinary people couldn't understand. As the orders increase, Lin Xiaoman gradually discovers that Fog City hides a fantasy world invisible to ordinary people, and his and Shen Qingci's fates have long been closely linked by some mysterious force.