Lifetime of Bliss And Contentment With You - Chapter 219: Dangerous State

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.

Kazuki’s life was painfully average—just another cog in the nine-to-five grind. His only escape? Binge-reading novels and no-lifing video games.Then he woke up inside one of those novels.Armed with unstable morals, unhinged humor, and a penchant for pettiness, Kazuki is determined to survive, thrive, and maybe cause a little chaos along the way.The world has no idea what’s coming.

“How long has it been?”10,000,000 Years, a period of time which he dwelled in the endless abyss as a captive of war.After his fall, he lost everything to the hands of those who stand above the heavens.The twelve gods of the constellations, the Primal Zodiacs!Creatures who descended down from the absolute light to consume all.He fought against them only to fall prey to their destruction, locked away in the endless Abyss.Astroth Vermont lost it all, his will, his empire, his powers and his mind, all he knew was despair.But that’s until he woke up, Returning back to the world as someone else.The Blackest Evil was reincarnated as the Tenth Young Master of the Reinhart Family.His return is going to shape the world, returning all into chaos!Will he exact his revenge?Who knows, welcome to the land of carnage

Shi Qian opened her eyes and looked at the man’s handsome face.

“You have to be responsible to me.”

The thin lips of a certain black-bellied evildoer slightly hooked, with a smile that was not a smile.

From then on, there was an extra goblin in the house of Lord Zhan, the great demon king of the imperial capital! The big devil turned into a faint king and spoiled the little goblin to the sky!

Some people: “It’s useless except for that face, it’s just a vase! I’ll be dumped by Master Zhan sooner or later!”

Not long after… the legendary god turned out to be that little goblin!

Why does the boss of the hacker army look a bit like that little goblin!

The founder of the popular game on the Internet is more like that little goblin.

The woman who defeated the number one expert in the ancient martial arts is also a bit like… a boss! Kneel down!

- Description from novelbuddy