ALL MY WIVES ARE BEAUTIFUL ELVES - Chapter 1: The world I used to love

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.

Mediocre is a common characteristic of the majority. But when someone outstanding appears beside you, your life will change because of him. That’s the principle of ‘who you mix around with is a reflection of yourself.’ The doctor in charge of the Three Flavour Hall will change everything. You can raise a campus belle, a CEO beauty…

In a world where mysticism and steam industry coexist, cursed objects, the Reception Bureau, and Evil God fanatics...That year, the King was bedridden with illness, the successor was inexperienced, and power slipped away, leaving the empire teetering.That year, external forces gathered around the empire, and foreign civilizations eyed it covetously.That year, the prophet delivered a prophecy that the era of civilization was nearing its end.That year, Ethan arrived at a small town on the outskirts of the imperial capital. To survive in this perilous era, he began practicing Fireball Skill.Years later, Ethan looked at the meteor falling from the clouds and realized there was a problem.The beginner Magic he learned seemed a bit off.

Becoming the physician of the villainess who brought about the world’s destruction, I tried to escape to survive, but the reactions were strange. ______________________________________________ “The Doctor Cured the Villainess and Ran Away” is a Korean web novel authored by 긘가 (Geun-ga). The story follows a protagonist who becomes the personal physician to a villainess responsible for multiple world destructions. After curing her, he attempts to escape, leading to unexpected reactions. The novel was first serialized on October 5, 2023, on the platform Novelpia. It gained recognition by receiving an honorable mention in the 2023 Novelpia Universe's Strongest Web Novel Contest. Readers have praised the novel for its engaging narrative and well-developed characters. A review on Naver Blog highlights the protagonist's repeated attempts to prevent the world's destruction and his complex relationship with the villainess, emphasizing the story's depth and emotional resonance. The novel is available for reading on platforms like Novelpia and has been published as an eBook on Kyobo Book Centre. In summary, “The Doctor Cured the Villainess and Ran Away” offers a compelling blend of fantasy and romance, exploring themes of redemption and the complexities of human relationships.