Transported to another world, Zhang Xuan discovers his unexpected calling as a teacher. With this transformation comes an astonishing development—a hidden library suddenly manifests within his consciousness. Should he witness any person or object, the library automatically produces a comprehensive record of their vulnerabilities and weaknesses. This incredible power makes him formidable beyond measure. "Emperor Zhuoyang, what compels you to constantly abandon your undergarments? As a ruler, wouldn't you demonstrate greater propriety?" "Fairy Linglong, whenever sleeplessness plagues you, feel free to visit me. I'm exceptionally skilled at lullabies!" "Demon Lord Qiankun, perhaps reduce your garlic consumption? That aroma is absolutely suffocating!" A remarkable saga following the relationship between mentor and disciple, as a dedicated teacher nurtures and develops the realm's most formidable cultivators to their utmost potential!