MTL - From Becoming the Master of Monsters - Chapter 669 Imperial Knight Commander Yuto

The middle boss of the AAA-class game produced by the company. The villain who dies 999 times out of 1,000 times. Deculein.That person, was me now.“You’re going to die on almost every route.”Deculein, like all villains, inevitably dies.[First and foremost survival goal: Be what the game requires you to be]I’ll have to survive even if it means twisting my fate if I am destined to die.

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.

Mu Wan Qing was dressed as cannon fodder playing a female supporting role in a book about a reborn female protagonist.

The heroine was her amazing and talented cousin. She was reborn on the way to exile, and she devoted all her clan to help her ascend to the backyard of the Emperor.

And Mu Wan Qing’s whole family was used as a stepping stone and was destroyed on the road of exile.

Mu Wan Qing: I am so tired, let’s destroy it.

In the chaos of the house raiding scene, Mu Wan Qing hurriedly grabbed the marriage certificate with a swoosh.

During the breaking up of the marriage, Mu Wan Qing exchanged the marriage certificate for a mule cart and twenty taels of silver and started a long journey of exile.

In order to survive, she resorted to roasting pig trotters, making fried chicken, farming cotton, and breeding sheep.

Engaged in building water power, building cities, building cement roads, and creating a prosperous fortress in the south.

Accidentally played a big game, and the plot was really shifted…

The Reborn Cousin: Everyone is concentrating on building infrastructure, how can I play the script of the palace fight?!

At the palace banquet, the arrogant and arrogant frontier master sat alone while pouring the drink. There was a commotion at the door, and the beautiful and heroic first female assistant, Mu Wan Qing walked in surrounded by everyone.

The man put down the wine glass and quickly ran over, with his eyes full of love, he said, “Madam, I can’t eat without you.”

There was an uproar at the scene.

- Description from Novelupdates

With a marriage contract forcefully done, he married her, and all she could do was comply, and resent him deeply for that and for all the following misunderstandings they faced.
However, it was already too late when she understood she actually loved him.