After Switching Bodies, the Mad Overbearing CEO Takes Over the Entertainment Industry - Chapter 45 - : The Face of an Angel, the Heart of a Devil

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

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.

Chen Lin traveled through the martial arts world and found that he actually had a clone, but…

“Why is my clone in the world of immortality?”

“Forget it, you can continue to practice martial arts. I am going to start cultivating immortality. I will meet you all again in a thousand years!”

…

Over the course of thousands of years, there will always be geniuses born from the sky, whose fame is as mighty as the sun, sweeping across the universe.

But no matter how heroic the Martial Emperor is, when they burn out the emperor’s blood and exhaust their souls, they finally break through the world of mortals with their withered and broken bodies, penetrate the layers of divine patterns and talisman formations, and see the figure standing at the end. …

The person who stands on the twelve-level lotus platform, wears the Mountains and Rivers Sheji Diagram, holds the Jade Order of Creation in his left hand, hangs the Four Swords of Killing Immortals in his right hand, and hangs the shadow of the Tai Chi Diagram behind him, will always turn around.

He smiled cheerfully and said to them:

“Coming?”

[Liu Jieliu] [Fu Dao] [Orion] [Martial Arts] [Clone]

- Description from novelbuddy

Tian Man Continent is a world of martial arts. A young boy named “Su Yi” led countless yao (monsters or demons) and overrode countless families who had thousands of years of history. He rose abruptly in the world as the brightest star in the sky. He married beauties and walked towards the peak of of the world, and finally ascended onto the thrones of the ancient gods!

- Description from novelupdates