Overlord (WN) - Volume 1 Chapter 21

The sky was painted gray forever. The light of the sun was restrained. The darkness of the night was deeper than ever. At such a time, he belonged to a class people didn’t even recognize as ’human’. He was at the bottom of the social stratum, a slave. And when his only family was taken away from him... he no longer had a purpose in life. Yet, he clung to life because of his promise. And he set an impossible goal for himself, just so he’d have an excuse to live. When he finally reached a place he never expected to be, in pursuit of a purpose he expected to fail and die miserably trying to fulfill... he awoke to a night that would change his entire life. He was an insignificant fly, a mere speck in the destruction of the Empire. But he... survived. And, despite being a slave, he gained the blessing of a king. Or rather, the curse...

With A Tale of Blades & Blood, the world of Avalion takes shape in the form of an all too familiar world. Filled with morals either clear or grey, war is inevitable while peace never lasts. Fifteen centuries of watchful peace and subtle tension have finally boiled, and the conflict rises once more, now filled with more bloodshed than ever before.Beyond the mountains of the Nortenhein, the Weslands arm themselves to take back their lands and bring forth to the south and the east A Bloody Winter. To the east, over hills and through forests of old and past the waters of the Red River, The East Plains stand tall with the Spire as its center, ready to fulfill their Dream of Vengeance. Deep in the south where the cities stand and to the west where the walls never crumble, steel meets steel as brother fights brother in A Dance of Fire and Swords.Witness the adventures of Orevian Ballister, Norien Ravenhan, Forien Strix, and Loran Aelond as they face battles of wits, blades, honor, glory, and tragedy in a story that shall never be forgotten:A Tale of Blades & Blood.

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

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.

“Emperor 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 Lord 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!

- Description from Novelupdates