Tiandao Tushuguan

Zhang Xuan arrives in another world and becomes a respected teacher. A strange library forms in his mind, automatically generating books that detail the weaknesses of anything he has observed, whether a person or an object. This ability makes him highly effective. Interactions include conversations with Emperor Zhuoyang about personal habits, Fairy Linglong about sleep, and Demon Lord Qiankun about his strong odor. The narrative centers on his role as a teacher, shaping and mentoring individuals who will become the world's top experts.