Photos of each of the SECRET members enthusiastically reading the same book were recently revealed on the the internet. The book that was displayed in the photos was the recently published, puzzle book titled, 'IU in Wonderland'. Netizens were amused by the members being completely engrossed in the book as if it unveiled secrets to IU's popularity. 'IU in Wonderland' is a book with a new and unique concept. The book is filled with various puzzles and is a brain-training storybook with the nation's best puzzle experts participating on the project. The entire book is in a pastel color tone and is also composed of IU illustrations. The book contains a variety of items including mazes, finding hidden photos to increase concentration and cognitive skills, locating the wrong picture, and magic eye photos. The magic eye photos were made so that when one looks at it, they'll be able to find out and have insight to IU's various tastes and style. Source + Photo: Star Today via Nate Shopping link: Yes24