My Necromancer Class - Chapter 295: Portal

'Divinity Online'. The new breakthrough in the Full-Immersion Virtual Reality technology. After decades of work, Divinity Corp had achieved the impossible. Creating a massive video game world that people can enter and live in as if it were Earth. Their goal was clear, to create a world other than Earth that we can call home.A place where the laws of reality vanish, and the true ceiling of power shifts completely.Naturally, the shockwave Divinity Online created across the entire globe was unlike anything else. Every single person has heard of it, even those who have had no interest in video games before.Giant corporations and even governments immediately rushed to start planning to invest in this new world and just like that, billions of people had their eyes on one single date: the 19th of July.***Arthur, like everyone else, had heard of the game and was as excited as everyone else to try it, if not even more. With how much he grew bored of his life on earth, this fantasy world was like the divine call he had been searching for. However, there was a very small problem.He had no money to buy the machine required to access Divinity Online. His wretched life had turned him into a broke teenager with no parents, and no relatives. But, by some kind of luck, he got his hands on one of those machines.Not knowing what was awaiting him in that world, Arthur was simply seeking one thing... A new opportunity in life and to find a purpose he could work for when he had none so far.[Welcome to 'Divinity Online'.][Assimilation Started...]

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

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.

In a foreign country, a leisurely little farmer.

Beer, side dishes, beef and sheep barbecue, small pond, three or five fish and shrimp, a pot of soup.

There are hundreds of flowers in spring, the moon in autumn, cool breeze in summer, snow in winter, and a hut in the woods.

- Description from novelbuddy