The Sweet Life: Secretly Married to a Movie Star - Chapter 1198 - : There are trees on the mountain, and trees have branches: Get engaged

The daughter of a duke, the stuttering Maximilian, married a knight of lowly status at her father’s coercion.

Right after getting the first-class chef’s certificate and before that certificate had been in her hands long enough to warm up, she woke up. Not only did she age ten years, she also gained two children…

—

At this time, her new daughter, who had lost two of her front baby teeth and spoke with a lisp, pointed at the TV screen and called out, “Dad!”

On the screen, the Film Emperor Meng Yan was extremely handsome and charming. Towards the camera, his gaze was overflowing with gentle and tender feelings. He raised up the hand that was holding hands with captivatingly beautiful bride. She was wearing a diamond-beaded wedding dress. At the bottom of the TV screen, the headline news was displayed in large font – Meng Yan and the rising starlet’s wedding of the century.

T/N: The second part of the summary is misleading. This isn’t a novel where the transmigrated main character clings onto the film emperor’s thigh.

- Description from Novelupdates

Ethan, a high school student that died alongside his bully transmigrated into another world.Ethan awakened in a parallel world, one where supernatural talents determined your worth, and the talentless serve as expendable cannon fodder.Born talentless in this new world, Ethan finds himself assigned as cannon fodder against the monster hordes that threaten humanity.But his death in the previous world seemed to have granted him a supreme Talent.Follow the story of Ethan as he awakens the strongest talent and strives to become the world's Strongest.

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.