Becoming the Wasteland Overlord With My Harem System! - Chapter 57: Valkyrie Knight Order

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.

Shen Yu's world is facing the apocalypse. With the help of his Gray Mist Space, he could do good things such as saving lives to gain more gray mist and use it to do everything he wants to do. And what's more, no one but him can survive in the Space. However, this time, two figures walk out of the Space, and when they spin around, Shen Yu is shocked, because the two figures are all him from different worlds.“Your world is facing an apocalypse too?”“Indeed.”

Young Master He had always been a male god in the eyes of others.

Until one day, the god-like him died.

And he became the much detested white silk trouser-wearing second rich generation.

Male God He was unaffected by this.

In his previous life, he had sacrificed everything for his clan, now, he could finally break free from that tiring life.

The only thing was that he had gained a handicapped partner.

Initially, he thought his partner was just a weak, gullible and pure lamb.

In the end, a certain person changed entirely making everybody cry and shout daddy.

- Description from Novelupdates

The young president, Yu Shu, is vigorous and unsmiling. The outside world commented that she is a high-altitude flower that can be seen from afar but not to be played. Prejudice.
At first, she hated Zhao Qingying, just because this woman delayed her brother’s study, and later, it was because… she was too profligate.
Xiaolang’s hooves should be cured!
Later, really fragrant——
One day, my younger brother saw his idol sitting in his living room, and said pleasantly, “Brother Ying, why are you here?!”
Yu Shu said meaningfully: “Well, it’s indeed a big wedding.”

Zhao Qingying’s flourishing beauty is the center of the topic, the darling of the media and the favorite of the paparazzi, and there will never be a shortage of gossip targets around her. One day, she was interviewed.
Host: “The boss of the hotel is dating you, is it true?”
Zhao Qingying: “My brother.”
Host: “The financial tycoon is rumored to be your benefactor, is the news reliable?”
Zhao Qingying: “My father.”
The host asked weakly: “Then Yu Shu, who has been in frequent contact with you recently, who are you?”
Zhao Qingying looked at the camera, her eyebrows and eyes curved: “My wife.”

The cold president who is obsessed with making money from games X the big star who only cares about teasing girls

[Don’t ask, it’s sweet to ask! 】
Content tags: powerful rich family entertainment circle sweet text
Search keywords: Protagonist: Yu Shu (shu), Zhao Qingying ┃ Supporting role: ┃ Others:
One sentence introduction: can’t laugh.jpg

- Description from novelbuddy