Zhang Jijun is an author about whom limited public information is available; only one work by this author, The Rules of the Heart, is included in the collection. Judging from its common classification, the book is a work of applied psychology, centering on psychological activity and patterns of behavior and attempting to turn psychological knowledge into everyday rules that readers can understand and refer to. In the book, the author focuses on discussing psychological phenomena in a way close to daily life, striving for clear and plain language that lowers the professional threshold and allows ordinary readers to engage with the subject. Because verifiable information about the author's personal life, educational background, and career is lacking, no further account of the author's experience can be given; the writing style and influence can also be judged only on the basis of this single work. Overall, Zhang Jijun enters the field of applied psychology writing with The Rules of the Heart, a book aimed at ordinary readers who wish to understand their own psychology and that of others.
