Delivery boy Chen Mo died in a car accident, but because of his high five-star rating, he was specially hired by the underworld as a "Yin Yang Courier". Bound to the merit system, his mission is to "deliver orders" to the souls of the deceased whose obsession has not disappeared - an undeliverable will, an unspeakable apology, and a token that spans life and death. During the day, he is an ordinary rider rushing around the city; at night, he shuttles between Yin and Yang, using express delivery to eliminate regrets in the world. Until he accepted a special task, the recipient turned out to be Gu Yan, a psychiatrist who always wanted to "end everything". From then on, there was one more soul in his delivery list that needed to be "sent" back to the world. When enough merit was accumulated and the resurrection progress bar lit up, Chen Mo found that he was a little worried and could no longer "confirm receipt".
