Black Knight plot
In 2071 people depend on respirators to breathe because of air pollution. Only 1 percent of the population survived and a strict social class now exists. People rarely leave their homes and when they do, they wear gas masks because of the air pollution. Citizens rely heavily on the parcel delivery service for their needs. Delivery men, also called knights, deliver the packages and also protect them from thieves. Knight 5-8 is a legendary knight. He is also very skilled in physical combat. He happens to meet Sa-Wol, who is a refugee. Sa-Wol dreams of becoming a knight and he admires knight 5-8. Seol-A is an officer in the Defense Intelligence Command. She saved Sa-Wol's life and takes care of Sa-Wol like he is part of her family. Knight 5-8 tries to help Sa-Wol become a knight.