Genesis Maker: The Indian Marvel (Rewrite) - Chapter 1: : Prologue: The Cost of Dreams

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.

Traveling through the troubled times, the strong are born, and the dangers are everywhere.

Lu Wangchuan found that as long as he consumed a certain amount of energy and blood, he could directly improve the level of his skills.

Consume 1,000 calories of energy and blood, and complete the Cracking Mountain Fist to open the monument and crack the stone.

Consume 10,000 calories of energy and blood, and cut the river with one sword at the full level of Wuji Swordsmanship.

Consume 100,000 calories of energy and blood, and destroy 100,000 enemies instantly with the ultimate Prajna Dragon Elephant!

…

Time flies, when the energy and blood exceeds a trillion trillion, Lu Wangchuan suppresses the sky with one thought, and destroys the gods with one word!

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- Description from novelbuddy

The salaryman who had a dream of becoming a CEO has finally succeeded.

However…

There was no one. No one was around to celebrate his success. Then on his first day of work, news of the death of a former colleague that he had laid off came. Additionally, his family left him, who was only concerned about the company.

The life he thought was right crumbled right in front of him. Where the heck did it all go wrong? Then, another opportunity came for Han Yoo-hyun, who had plunged down into despair.

This time, for sure. He was going to live properly. He was going to change it all with his whole being. The new life that Han Yoo-hyun was creating.

That valued life that will outshine any other is unfolding now!

"Your bed is cold," spoke a voice in the room that had her eyes go wide in fear. Nervously, she turned around, gulping softly to see a shadow on her bed as if someone laid down there. The man who had been lying down sat up emerging out from the shadows where he had been waiting for her.