MTL - Shura’s Wrath - Chapter 821 Reunion

Hit by a truck as a young man, after winning God’s ultimate lottery prize, I got to create a HOLY sh*t-like cheat ability of my choosing, create a harem, make loads of money, sleep with a random babe, and do anything I liked; it’s that kind of story.

Dressed as [fantasy world] [patriarch], portray the fantasy world as realistic as possible from the perspective of the family, grow spiritual fields, raise spiritual fish, develop various family industries in an all-round way, support salted fish elders to become ancestors to serve as umbrellas, and inspire juniors to bravely venture The Holy Land Academy has come to the fore.

It is not a fantasy of passionate combat, but is based on the promotion of various family industries, capital, facilities, domestic servants, family generals, clansmen, guest officials, in-laws and other elements. Trying to see the “old-fashioned” fantasy world from a fresh perspective.

- Description from novelbuddy

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.

[Warning: R-18]Lukas had just started making his career in a good company, allowing his family to live comfortably, when he was poisoned by some of his jealous colleges during his promotion-celebration dinner.Everything blanked out in front of his eyes and he thought he was dead.Miraculously, however, he regained his senses but he was no longer the Lukas Adams, the rising star of his company--he was now Lukas Rivervale, the youngest son of Viscount Raymond.Clearly, he had transmigrated.After accepting his new reality, he realized the world he was in was a Magic World, dominated by Mages.In this world, only strong were respected and because he had failed his awakening ceremony at the age of 12, he was despised and looked down up.What a tragedy!Fortunately, the Goddess of Luck seemed to be smiling upon him because he realized he now possessed the Legacy of an Arcane Mage, one the strongest beings to ever live in this world.Vowing to become the strong enough to find a way back to the Earth and take revenge on those who plotted against him, he embarks on the path of a Mage.