MTL - Journey To Longevity - Chapter 1037 All souls return to ruins

I returned to the past to become an actor, instead I reincarnated as a Third-Gen Chaebol (rich conglomerate family).[Winner of the 7th Korean Web Novel Competition]

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.

I was just your average burnout. Now I’m a kobold in a dungeon where everything wants to eat me—and frankly, I get it. I look delicious.Reincarnated as the weakest possible monster in the worst possible place, I start with nothing but panic, backward knees, and a skill called Civilization Mimicry—which is sealed. Because of course it is.But survival isn't the story.This is the story of what comes after.Of finding meaning in the scraps. Of building law from ashes. Of kindling memory in a place designed to erase.Because even if the world sees kobolds as nothing, I’ve seen what we used to be.And I’m going to bring it back.Firelight by firelight. Burial by burial. One fragile tradition at a time.Because if the world wants kobolds to be nothing?Then I’ll teach it what nothing becomes when it learns to dream.

Once feared as the Queen of Shadows, Eydis now faces her greatest humiliation: high school.Stripped of her magic, her kingdom, and (most insultingly) her dignity, she’s stuck in the body of a weak, whiny teenager with no power, no allies, and no money. And her terrifying familiars? Complicated. Her new greatest adversary? The Maths teacher.And we certainly can’t forget about that giant, pulsating eye watching from the heavens (debatable), ominously known as… The Eye… (I know, right?) that threatens to tear apart her new reality.But one thing Eydis hasn’t forgotten: shadows always trail after you.The real question is whether she’ll stand in them once more as their queen… or be swallowed by them, piece by piece.“Royal Reboot: Level Up, Your Majesty!” - a comedic dark fantasy where nothing is as it seems and every choice could be her last.A/N: Action/Romance/Slice of Life/LGBTQChapter updates weekly, weakly.While the story has a comedic undertone, darker themes are presented.