Zhang Zhongyuan is a delivery rider of a certain group who was born on the Ghost Festival. After accidentally activating an ancestral pendant, he gained the ability to travel between the yin and yang worlds. His mobile phone can receive orders from the ghost world, and he can see hundreds of ghosts with his eyes, becoming a special "courier" who delivers goods to people and works for ghosts. In the process of adapting to his abilities, he met the mysterious girl Ayou, who was named a "ghost errand" by the judge of the ghost world, and began to help solve cases.
As the investigation deepened, Zhang Zhongyuan found himself involved in a huge conspiracy. The origin of the pendant, the value of the special bloodline, and the terrifying plan to subvert the yin and yang order gradually emerged. At the same time, many women connected with Zhang Zhongyuan's fate appeared one after another: policewoman, librarian, exorcist, etc. They each had similar goals, but they were impressed by his charm while fighting side by side.
In order to protect the bonds and explore the truth, Zhang Zhongyuan led this group of friends who were destined to travel through the modern city and the classical netherworld, solving mysteries in the bizarre and strange world, and fighting against the dark forces that overturned the two worlds.
