Heng Sao Tian Ya

Traversing into another world, Zhang Xuan finds himself becoming an honorable teacher. 
Along with his transcension, 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 weaknesses will be automatically compiled in the library. 
Thus, he becomes formidable. 
"Monarch Zhuoyang, why do you detest wearing your underwear so much? As an emperor, can't you pay a little more attention to your image?"  
"Fairy Linglong, you can always look for me if you find yourself unable to sleep at night. I am skilled in lullabies!" 
"And you, Demon Monarch Qiankun! Can you cut down on the garlic? Are you trying to kill me with that stench?" 
This is an incredible story about teachers and students, grooming and guiding the greatest experts in the world!
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Millman97

Library of Heaven's Path

StarveCleric

Daoist6fubtiW

Seeing how rashly Zhang Xuan had agreed to Old Geezer Yu's challenge, the old ancestor of the Zhang Clan was horrified.

"Have you thought this matter through?" he asked Zhang Xuan worriedly. "You won't be allowed to use your tamed beasts or the seedling; you'll only be able to use your own weapon! It's not too late to back down now."

"I don't intend to back down, and I hope that the other party won't back down either!" Zhang Xuan replied with an indomitable air. With a straightened back, he said, "Suppressing the Otherworldly Demons is part of my responsibility as a master teacher. Even if I'm no match for them and all of this is nothing more than a futile sacrifice, I won't back down!"

"Well said!" the old ancestor of the Zhang Clan roared with a hearty laughter.

I'll Humbly Accept Them