Benge, a genre of mystery novels, can also be called authentic, orthodox, classical or traditional. Logic-oriented reasoning is the main way to solve puzzles, which is contrary to the realistic social school. With thrilling and bizarre plots and intriguing tricks, the plot is unfolded through logical reasoning. There are usually many types of tricks, such as killing in a secret room or killing in an isolated island.

Change the case into the genre of mystery literature. This kind of school pays attention to describing abnormal psychology, and its content is mostly eerie and absurd. In order to describe the darkness of the human world, or to express the author's inner nightmare. So there are many classic works.

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Lin Ping Hatsunosuke, a proletarian writer and detective novel critic, was the first person to explain the "Biange School". As early as 1926, he pointed out in the article "All Aspects of Detective Fiction Literature" that "novels that explore the theme of mental illness and abnormal psychology and present surprises and surprises through mysterious techniques can be classified as" Imperfect School "and" Voice School "for solving puzzles and reasoning.