A colleague asks Zhou Chuan to check a bank card number used to receive a so-called private bonus. Zhou Chuan keenly notices that the other person's card number differs from his by only one digit, perceiving hidden danger. He quietly cancels his bank card, avoiding the meticulously laid trap. Faced with the colleague's public framing and false accusation, Zhou Chuan produces the account cancellation certificate, exposing the scam with the help of bank evidence, and hands the criminal over to be dealt with by the law. Having seen through the trade-offs of workplace interests, Zhou Chuan chooses to resign, return to his hometown, and open a bookstore. Later, following clues to ferret out the mastermind behind the scenes, he sets up an anti-fraud reading corner to help more people raise their awareness of prevention and guard their ordinary, stable lives.