Please Take Care of Me, Young Master Quan - Chapter 269 - : Revenge, A Tooth for a Tooth

Born of a great family, world shaking genius.

The man who had shaken the world.

The story of the Swordmeister.

On the day of the wedding, Feng Xi Er laid on top of the ‘Ghost king’, eager to take off his wedding robe. He squinted his eyes, flipped over and switched their positions. He held her dishonest hand and said, coldly, “Miss is so eager to get on This Prince? Are you so desperate?” Feng Xi Er was just desperate to prove something, and once again reached out to take off his mask. The Ghost King smiled evilly, grabbed Feng Xi Er’s wrist and began to remove her robe and say: “Since Miss wants it, This Prince shall satisfy you…”

- Description from Novelupdates

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.

There was a man in the modern world that built his business empire from scratch. He was hailed as a genius by his peers and was respected worldwide due to his contributions to the world.If it is not only for that unfortunate accident that led to his death. He was a man who could potentially change the world with his mind that still stores a plethora of ideas.But—fate had others plan with him. He found himself in another world, what’s more, it’s primitive and technologically backwards compared to his last world. And what’s more, he turned into his younger self, and in this world, he was an orphaned boy.For him to survive, he must use everything that he had at his disposal, and that was all in his head.