Wang Ye is a young man who, for reasons no one explains, is picked by a mysterious post office to work as a ghost messenger. The appointment awakens special powers in him, and it drags him again and again into dangerous paranormal events. The world is sunk in an endless night of disaster, where fear spreads and strange phenomena are everywhere. Wang Ye works to unravel these mysteries and to keep humanity's hope of survival alive in the frightening dark. The ONA mixes action, horror, mystery and the supernatural.