Transmigrated into another world, Zhang Xuan awakens to find himself a teacher—and a mysterious library embedded in his mind. Every person or object he sees automatically generates a book listing their weaknesses. From sloppy emperors to sleepless fairies and garlic-breathed demon lords, no secret is safe from his all-knowing gaze. Want to dethrone a tyrant? Just flip the page. Need to tame a goddess? The library’s got you covered. But as Zhang Xuan wields this forbidden knowledge to groom the world’s greatest experts, he soon realizes that wisdom comes with a price—and his students might just outshine him. Dive into a riotous tale of martial arts, romance, and absurd humor, where the line between teacher and student blurs. Can one man’s library conquer every realm? Open the book and find out.