Realizer of Death : The Reaper - Chapter 72 72

He was able to repeatedly reincarnate due to the effect of the Nine Lives Reincarnation Spell, which allowed him to have nine lives. After defeating the Hell-Blood Demon who drove the entire murim to chaos, the patriarchs of the Seven Great Clans betrayed him and killed him. Following that, he was reincarnated for the ninth time as Baek Mu-Gun. Now, his last journey across murim begins.

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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.

Super-genius Ellen Young, creator of countless tech products, retires.At the height of her career, she turns down numerous high-paying offers, yearning only to return to the countryside and lead a peaceful, laid-back life.Unexpectedly, her long-lost family comes looking for her, and a celebrity sister requests to live-stream their countryside life online.Ellen Young: ?A big, fat no!Netizens around the world think that this newly found daughter in the celebrity’s family is illiterate, lacks manners, is completely crass, and without any redeeming qualities.Becoming a laughing stock of the internet.Until.....Why is a world-renowned professor calling her teacher online?Why does a well-known CEO furiously comment 'If you don't come back, I'm not managing this company anymore'?Why are numerous consortiums sending barrages online, appealing for lower patent fees?—Isn't this just a country girl selling radishes online and making ads?

She has stunning looks and talents that are even more amazing, but she hides both deeply because she understands that beauty is never a blessing. One who is beautiful can only bring trouble, especially within such a society where evil runs amok. In addition, one who is too crafty is disliked.

So to the common eye, she is an ugly woman, so ugly even ghosts would be too afraid to look at her, a weak, ignorant lady.

An imperial edict forces her to marry the well-renowned prime minister of Dong Ling. She cleverly deals with her situation as she faces hidden and openly disdainful looks, smiling coldly and looking on indifferently. She did not want any of this. Why do women make things harder for other women?

She is the ugly, cowardly, useless, frail Lady Zi Yinye. But she is actually the handsome and brilliant prime minister Ye Yin!!

- Description from Novelupdates