In Naruto: Reborn with a Chat Group - Chapter 165 - 163: Mangekyo Sharingan

After being a young master for more than ten years, he was reborn overnight became a ger who had nothing. This ger was still a lunatic!

Crazy people were hated in the tribe! He was also bullied and robbed! In the end, he was forcibly betrothed to a beastman that he didn’t even recognize.

After accepting the facts tremblingly, Wang Jin began to use the golden finger to reverse the adversity.

Being disliked by others and then becoming everyone’s favorite, snatching back everything that was robbed, as for… the beastman who was forced to marry…

Wang Jin looked at the man who had been standing by his side, and the man felt his gaze, looking back at Wang Jin, his indifferent eyes suddenly became warmer. He stretched out his hand and clasped Wang Jin’s ten fingers tightly, and said softly: “In this life, I only want you alone, no matter whether you are a little lunatic or not.

Wang Jin’s heart skipped a beat.

Forget it, this man… is quite interesting, so let’s keep him!

Years later, Wang Jin was pregnant with a big belly, gnashing his teeth with hatred when he saw the gentle and flattering man in front of him.

We agreed to only be together, and never get pregnant!

A man’s mouth, except for himself, was a deceiving ghost!

- Description from Novelupdates

Seol Woon-hwi, the Blood Heaven’s Righteous Blade, rose to power, becoming second to none under the heavens, reigning just beneath the sky itself.Yet, at the height of absolute power, he finds himself returned to his past—back to his days as the scorned illegitimate child of the Everlasting Snow Palace.

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.

A striking man of mysterious origin and peerless talent, he looks back at the world, in all its entirety, with utter disdain. And yet, in the treacherous and unpredictable ultimate formation of the Boundless Secular World, he guards a breathtaking ancient qin with broken strings, waiting silently for the destined one to arrive!

A boy encounters him, and knows for the first time that the world beneath the Heavens is a fickle place. Not even demons, devils, ghosts and monsters can match the frivolity of human nature!

A slender physique, and jade-like beauty, but the sword that strikes between heaven and earth is not unlike a streaming rainbow!

The vastness of the starry sky, the seven emotions and six desires! Greed, anger and ignorance! The teachings of Buddha will grant you boundless strength!

A sea of blood will come, at the cost of all mortal beings full of honest hope!

The ghosts wail as the gods roar, but the sea of blood has no end!

Where, pray tell, is the path I should take?

Since there is no path, no matter how bitter and bloody the sea, even if my boat is made out of bones, I will soar to the heavens above!

- Description from Novelupdates