Soldier King's Love Story in the City - Chapter C250

A relaxing story of a business tycoon who, sick of machinations and struggle, returned to the medieval world and married into a merchant family to become a “zhui xu,” a husband that lives in the wife’s home. Even though his intentions were not so, he could not avoid the matters of family, country and world.

“There was once a person that stood at the top of the golden pyramid,

with the innumerable cheap jealousy and envy of people,

he walked this road escorted by tens of thousands of people,

yet he could not escape the long and lonely sleep under the gravestone. ”

- 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

Lucifer, an ordinary orphan boy who was brought up by a wealthy family to be the playmate of their daughter.That's how things have been until one night, when he got attack by something unnatural, that was the night the world changed for him.p.sThis world is going to be dark, lots of killings, a lot of r18 contents, most not even involving the MC, also Mc is not going to take all the girls he comes across, he will have female friends he will make along the way, there will be Yuri contents and lots more, but Actions prevails them all.

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.