The present invention has a structure in which the cover 10 is folded in a half width in the booklet 1 to which one side is bound, for example, by folding the cover 10 in half width, And the rest 30 of the inlay 30 can be seen by folding the cover 10 in full width so that the cover 30 can be seen only when part of the cover 10 is folded in half width It is divided into visible part and hidden part in correspondence with each other, so that problem and answer, core contents and details are separately recorded, so that it is possible to find important and important things easily and quickly when reading a book or a notebook.
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