Country A seems calm during the day, but at night it is a different side of cruel darkness. Night is the stage for black professionals collectively known as "Black Boxers". Yu Jinxian, the leader of the killer company "Black Day", brings powerful hackers back to the company, while the "Red Moon" organization on the other side proposes cooperation. Behind the simple superficial interests, hidden is the most fragile secret of the black professionals in Country A for many years...