Lone: The Wanderer - Chapter 32Book 1: : Dungeons and Orb

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.

Su Yan adored Xie Yu for many years and finally got what she wanted, but Xie Yu ran away on the wedding day, making her a laughing stock. At that time, Bai Xingfan appeared in front of her. He held a black umbrella in his skeletal hand to shield her from the heavy rain, and the other hand stretched out in front of her with a gentle and determined voice: “Don’t be afraid, still With me.” Su Yan was stunned with tears in her eyes for a long time, and finally, she reached out to Bai Xingfan.

- Description from Novelupdates

The most unexpected weird destiny,
The most intense brain collision,
The cruelest battle of life and death,
The craziest bizarre fantasy,
The most bizarre truth …
It’s the first time, and another ten years!

- Description from Qidian

In this captivating fantasy novel, Luo Mu has spent fifteen years in a mystical world, feeling disheartened by the belief that hard work yields little reward. Just as he begins to lose hope, a miraculous system activates in his life—the Heavenly Path Rewards Diligence System.With this newfound power, every effort he makes leads to astonishing gains, governed by a unique critical hit mechanic that can amplify his rewards by up to ten thousand times. As he diligently practices his cultivation techniques, immerses himself in ancient texts, and rigorously trains in powerful martial arts, he experiences unprecedented successes: gaining rewards that skyrocket from hundreds to thousands, and even ten thousand times his initial effort.Years later, as Luo Mu stands at the zenith of strength and ability, he becomes a figure of admiration and inquiry. When asked how to achieve such greatness, he simply smiles and states, “The Heavenly Path rewards diligence; it’s all about hard work.”This tale explores themes of perseverance, the value of effort, and the extraordinary possibilities that come from dedication and hard work in a richly woven fantasy world.