Elven Domination: Reincarnated with a Cloning System - Chapter 18: Unexpected Situation

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.

Brave, wretched, kind, cunning, generous, greedy, elegant, vicious, happy, perverted, honest, prudish…

In this doomsday world, only by winning in the alien battlefield can resources be obtained to ensure the continuation of civilization.

Every soldier who enters the alien battlefield will randomly get a keyword of his own.

If the words and deeds match the key words, various attributes will grow rapidly and obtain superhuman abilities. On the contrary, if the human design collapses, it will quickly weaken;

This is a world of acting skills;

Acting is eating and drinking, acting is glory, acting is privilege, acting is life…

…

There are already completed Wanding works “Dream Master of Ten Thousand Worlds” and “Ten Thousand Ways to Eliminate Players”. The completion of this guarantee is guaranteed, please feel free to enter the pit.

- Description from novelbuddy

It is a parallel world that is full of Star Power. Star Maps, Star Techniques, Star Pets, and the Awakened are rampant. Jiang Xiao, whose soul travelled to this world, has a special internal Star Map within his body and goes on to become a Medical Awakened.

Kim Hyun Woo lived the life of the wealthy thanks to his parents. But one day, he received a phone call informing him of a traffic accident which involved his parents. His father had died and his mother was hospitalized in critical condition. The normal life he once knew, collapsed…

They sold their house, cancelled various insurance plans, and moved to a one room apartment. And after a few years, Hyun Woo spends four to six hours tending to his mother and worked to pay for her medical bills.

One day, one of his Instructors recommended him for position in a company called Global Exos, who made an announcement of making history with the newest technological invention.