Billionaire's Long Journey of Chasing His Love - Chapter 32 - 027: The Morgue Is to the Right of the Basement

Ian Percus, the second son of a countryside Viscountcy.

One day, he received a love letter from the future.

‘If we don’t protect the future, the world will perish.’

With an ominous warning scribbled by someone

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.

One day, a silver-haired goddess appeared before him.“Heaven-Defying Star. The one who goes against fate. The sole savior of a world doomed to end—”What the hell is this woman even talking about?“You must be the Regressor.”“… What?”No, I’m not.

Gray was just a normal guy. No powers. No family. No future.In a world where strength and status decide everything, he was at the bottom.He worked hard just to survive, taking care of his little sister after their parents were gone.But no matter how hard he tried, life never gave him a break.And after losing his only job, Gray was ready to give up completely.Then something strange happened.Just as about he was to end his life, an unknown voice echoed in his ears.[Welcome to the Great Tycoon System.]And for the first time, Gray had a way to fight back.From being weak and broke, he’ll rise to the top—one coin and one job at a time.Because in the world where money can buy power, Gray is about to become the richest and strongest man alive.