On the thirtieth night of working overtime and delivering food nonstop, 25-year-old delivery rider Lin Xiaoyang receives a strange order addressed to “Yellow Springs Road, Number 444.” When he nervously completes the delivery, he discovers that the recipient is none other than Black Impermanence, director of the Underworld’s Office in the Human Realm. The previous “yin-yang courier” accidentally reincarnated, leaving the Underworld in urgent need of a temp. Lin Xiaoyang is forced to sign a “Temporary Underworld Bailiff Contract,” becoming a special delivery rider who connects the worlds of the living and the dead.
