To be a good teacher, you must know your student's weaknesses. Xiao Ran knows everyone's. After a strange accident, a mystical library appeared in his mind, instantly creating a detailed book of flaws for anyone he looks at. From emperors with embarrassing secrets to ancient demon lords, no one is safe from his sight. He only wants to guide the next generation of experts, but his power is too great. How long can he hide a secret that could make him the most feared being in existence?