My Salvation Game Became true?! - Chapter 10 - : The Legendary Top Class Investigator

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.

Genius, antisocial, solitary, intractable , maniacal.

At the turn of every era, it is he who raises the flag of the rebel cross.

Winners take it all, losers take the fall.

He who brings order to a chaotic world, assembles talents and masterminds.

He who hides among the crowd, yet stands on the top of the world.

— The one and only, him.

- Description from Novelupdates

Tang Zhixi is the illegitimate daughter of the Song family?

You grew up in the countryside and never went to school?

The Song family also claimed that they would never recognize her?

…

Until Tang Zhixi’s identity was uncovered, the Song family immediately prepared a banquet.

But Tang Zhixi directly refused, “Your Song family is also worthy?”

…

The third master in Dijing actually fell in love with a wild girl who had never even attended school.

I heard that I still hold it in the palm of my hand and pet it.

When the entire imperial capital was shocked, Ye Sanye said a word quite proudly: “My wife is not simple.”

…

Ye Hanzhi never believed in love at first sight until he met Tang Zhixi…

There are beauties in the north, who are all over the country and all over the city…

**

Tang Zhixi liked to wear skirts very much, and later… Ye Hanzhi’s shirt cuff buttons were all the color of her skirt.

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- Description from novelbuddy

I became a scientist for an evil organization.…But I’m too competent.