He Is Warmer Than Time - Chapter 1824 - : You can try

After his soul transmigrated into the world of Teyvat, Luo Qing was selected to become the new Trainee Fatui Harbinger, and he was about to be sent to Liyue on a diplomatic mission (to cause chaos). To his surprise, he awakened a “Frustration Value Collection System” — as long as he frustrated others, he could collect frustration points, which he could use to participate in a lottery.As he stared at the list of items in the lottery interface, Luo Qing fell deep in thought:“Spirit Speech: Time Zero,” “Multi-Shadow Clone Technique,” “Thunder Breathing Style,” “Golden Experience Requiem,” “Railgun,” “Gomu Gomu no Mi...”Why on earth were these things appearing in the world of Teyvat?!Given the notorious reputation of a Harbinger, Luo Qing knew that if he didn’t grow strong, he was certainly doomed to a miserable end. Thus, his style became... increasingly abstract...---Years later, to prevent the infamous Fatui Harbinger, Luo Qing, from causing havoc everywhere, the people and political leaders of the Seven Nations united to issue a formal protest to Snezhnaya.In response, the Fatui in Snezhnaya issued an official statement:“This Harbinger is only a trainee. He has been dismissed.”

【Kill decisively! Domineering! Violent and invincible text! 】

Mu Huang, the helm of the Earth Trillion Group, was framed by his family and died.

The soul travels to a fantasy world where force is paramount, and becomes the Longhan Dynasty, one of the three founding families, Mujia, and the most talented one since the founding of the country!

However, at the age of sixteen, he was murdered by an adulterer because of drunkenness, and was sent to the frontier to never return to the imperial capital.

I thought that life in the frontier would be with me for the rest of my life, but unexpectedly when I just turned 18, I suddenly activated the “Three Thousand Demon God Lottery System” and gave away ten consecutive draws at the Demon God level at the beginning!

Congratulations to the host for getting “Chaos Demon Sacred Body”, “Chaos Evil Eye”, “Chaos Heart”, “Devil Luohu Two-Second Experience Card”, “Three Thousand Demon God Fragments*10”, “Chaos Demon God Essence Blood”, “Chaos Personal Guard*2” …

Time flies, and seven years later, the pilgrim minister actually decreed that Mu Xiaoqian, the shepherd family, betrothed to the royal family of the Great Yuan Dynasty next door.

When Mu Huang learned of this, he was furious, how could his sister’s marriage be dominated by others.

  On the same day, with the Hundred Emperor Dragon Knights that he had personally trained, blood-stained the imperial capital, entered the imperial city…

However, it was told that Mu Xiaoqian was picked up by the Yuan Dynasty mission yesterday…

The Desolate King was furious: Since you don’t want to be emperor, then let your son do it instead!

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- 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.

Amakawa Haruto died before he’d the chance to reunite with his childhood friend who disappeared five years ago. Rio, a young boy living in the slums seeks revenge for his mother who was murdered in cold blood in front of him when he was only five years of age.

There exists the earth many knows of and there exists an alternate world. Two people, each with their own backgrounds and values. For odd reasons, the memories and personality of Haruto, one who should have died resurrects in Rio’s body. As the two are confused over their memories and personality fusing together, Rio (Haruto) decides to live in this new world.

Along with Haruto’s memories, Rio awakens an unknown but special power. If he’s to use it, it looks as if he can live a better life, but before that, Rio encountered a kidnapping which results in involving the two princesses of the Bertam Kingdom.

After saving the princesses, Rio is given a scholarship to attend the Royal Academy, a school for the rich and powerful. His background being a poor orphan who once lived in the slums, the school full of nobles was rather a detestable place to stay at.