Reincarnated As the Enemy's Wife: Married the Rival, Bound by Revenge - Chapter 52: Let’s Go to the... Bathtub

In the early world of immortal cultivation, there was no physical cultivation among immortal cultivators. And a top bodybuilder who came from the earth has opened up a new path here and became the ancestor of physical training.

- Description from novelbuddy

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.

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.

MC (female protagonist) dies in a plane crash and wakes up in the body of a beautiful but corrupt and lascivious prime minister in ancient times, Zhang Qinglian. As circumstances decree, he (she) cannot reveal that the original owner’s soul is gone else calamity might occur. So he (she) decides to walk a righteous path, determined to help the lovely but simple little emperor rule the country. Not backing down after facing torture, not losing courage, destroying rebellions and facing off with scheming princes.

- Description from Novelupdates