Hell's Handbook - Chapter 455

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.

He chose her out of curiosity, and she chose him for a good sleep.In this one-year hidden marriage, they agreed to take what they needed and have only pleasure without love. But the reality was that he was very domineering. He could bully her, but if anyone else did the same, they would face severe consequences.Many people felt sorry for him and thought that she didn't deserve him. However, they discovered that her real identities were stunning and extraordinary.She was a genius hacker, a skilled miracle doctor, and even a deadly ghost...Now, people felt sorry for her. How could an astonishing woman like her marry a disabled man?Suddenly, a man who had been in a wheelchair for several years stood up and revealed the business empire he had built during those years.Later on, people started to envy the couple's talent and beauty.While the heavens favored them, she suddenly realized that in his heart, she was nothing more than a substitute...Love was just like poison hidden in sugar. If you believe in it, you lose...

Lin En transmigrated into a magical world that resembled medieval Europe but had the power of magic.Here, magic could affect and control basic particles, which was based on scientific theories that served as magic formulas!The wizards, who were actually scientists, were struggling to explore the truth of the world under the chase and blockade of the church. Lin En’s arrival sparked a renaissance of the alternate world…The white phosphorus fire, known as the Flame of Hell, the liquid nitrogen field of extreme cold, and the resonance frequency that kills without a trace… A few years later, the Holy See gathered all countries to the city, known as the legendary wizard, the pioneer of magic Lynn under the gaze of a group of wizards, wrote down the mass energy equation known as the ladder of God by later generations! Lynn looked around the crowd and said nonchalantly. “Mass and energy are interchangeable, and based on this theory, I have developed a powerful forbidden curse… It’s called — “The Big Nuke!”We will re-examine the world from the perspective of magic, where science is magic, and magic is science!