The Black Hole of Express Delivery

In the express delivery system, each item has a number, address and processing result. Signed, rejected, returned, lost, as long as you select a status, the matter will be concluded. As for why the package was not delivered or where the person who was originally waiting for it went, the system is not responsible for asking. Zhou Di is twenty-nine years old. He has done warehouse handling and intra-city delivery. After his younger brother Zhou Da disappeared, he took on the debt for his younger brother and became a courier. The most important thing every day is to put the packages in the car into the right hands, so that there will be one less complaint and one less ticket, so that we can continue running next month. On an ordinary delivery afternoon, a black hole the size of a coin appeared in the cargo compartment of his electric tricycle. It doesn't swallow money, doesn't collect garbage, and can't store goods for him. The black hole only reacts when a truly undeliverable package approaches. It swallows the package and spits out a key, a sound, or something related to the real recipient. Each clue points to a stretch of delivery duty interrupted by address, identity, or human rules. Black holes don't have instructions. Zhou Di can only find the answer from the receipt, scanned records, tape traces and old addresses. Every time a person or thing is recovered, he may bear compensation for lost items, statute of limitations penalties, and greater real risks. After the number of uses increased, the hole slowly expanded and began to swallow the iron sheet on the tricycle, approaching his daily life.