Traversing into another world, Zhang Xuan finds himself becoming an honorable teacher. Along with his transcension, a mysterious library appears in his mind.<br> As long as it is something he has seen, regardless of whether it is a human or an object, a book on its weaknesses will be automatically compiled in the library.<br> Thus, he becomes formidable.<br> “Monarch Zhuoyang, why do you detest wearing your underwear so much? As an emperor, can’t you pay a little more attention to your image?”<br> “Fairy Linglong, you can always look for me if you find yourself unable to sleep at night. I am skilled in lullabies!”<br> “And you, Demon Monarch Qiankun! Can you cut down on the garlic? Are you trying to kill me with that stench?”<br> This is an incredible story about teachers and students, grooming and guiding the greatest experts in the world!