Story not mine.

Zhang Xuan traverses into a foreign world and becomes an honorable teacher. A mysterious library appears in his mind. As long as it is something he has seen, regardless of whether it is a human or an object, a book on its weakness would be automatically compiled.

The original Zhang Xuan was the most pathetic teacher in the entire Hongtian Academy, for there wasn't a single student in his class. His cultivation was the weakest and he was ranked first from bottom in the entire Academy for the Teacher Qualification Examination, being the first in history to get zero marks in the exam. Among all of that he even misguided a student, causing his cultivation to go berserk. Depressed, he used alcohol to drown his sorrows and in the end died, providing an opportunity for our protagonist to leap over. After transcending into the original Zhang Xuan's body, the protagonist awakes his unique ability: the Library of Heaven's Path, that, among other things, gives him the power to obtain some knowledge about any living creature that displays his cultivation in front of him, including information about the mistakes and imperfections in his cultivation path and techniques

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