The story takes place in the fictional modern city "Xingang". An ordinary young man, Han Zhou, accidentally got involved in a spy war with intricate details, because an encrypted diary became the focus of competition among various forces. Faced with a sophisticated hostile organization, dangerous identity exposure, and complicated emotional bonds, Han Zhou gradually grew into a master of espionage with the help of Tang Lan and Lin Qin. In the midst of tension and crisis, laughter occurred frequently, and jokes and spies flew together. In the end, wisdom revealed the mystery of human nature behind the spy network. The plot of the book is compact, and each of the three volumes has a climax. It is both humorous and thought-provoking.
