Yu Yang, a fresh graduate, unexpectedly received an offer from "Netherworld Express" after failing to apply for a job. He was attracted by the high salary to join this mysterious company, but found that the company operates in strange ways and his colleagues behaved strangely. During this period, the protagonist encounters:
1. Weird mission: Yu Yang encountered a supernatural phenomenon during his first mission. The delivery address was actually the morgue of a funeral home, and the recipient was a deceased old man. He was deeply shocked when he witnessed the ghost of the old man signing for the courier.
2. The truth revealed: Company director Ma Xiang revealed the truth to Yu Yang - Netherworld Express is a special agency that connects the yin and yang worlds, specializing in providing services to ghosts stranded in the world, and Yu Yang was selected because of his natural "yin and yang eyes".
3. Special mission: Yu Yang was arranged to partner with Niu Tou, a senior courier, and began to accept real express delivery work in the underworld. He was responsible for handling the unfulfilled wishes of various ghosts and helping them go to the underworld with peace of mind.
4. Dangerous mission: Yu Yang and Niutou received a difficult mission - to deliver a parcel to a female ghost who died unjustly. This mission will lead them to uncover a huge conspiracy involving the Yin and Yang worlds...
