Mr. Gu, Your Replacement Bride Is A Big Shot! - Chapter 1470 - Destruction

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.

He Ruge was addicted to “Your Exclusive Lover” this love nurturing game. Captivated by the attractive military uniforms person, whose original form was a White Tiger Male God.

When the game came to the end, He Ruge suddenly become a mermaid and transmigrated, and he was even the legendary Koi Mermaid with flourishing beauty, charming singing and exceeding good luck?

The place where he fell was even more unusual – the bathtub of the Male God!

___________

The federation’s Xi Guican, a man whose stamp of his foot could make the whole intersteller tremble. During his recuperation, there appeared a love game that could not be deleted from the optical computer.

The plot of the game was his secret past. In this love game, he returned to the experimental days of No. 20, allowing people to slaughter and bully him, there was only one variable.——

It’s his exclusive lover.

The love that came from the light, taking him out of the dark.

- Description from Novelupdates

Caelith doesn't want too much in life, a clean home, a happy mother, and maybe a girlfriend. Raised in the Stormont manner, one of the highest ranking noble household in the kingdom, he grew up a bastard, mistreated and abused by the main lineage.At the tender age of sixteen nobles undergo a divine ceremony, receiving the opportunity to be blessed by the gods however he receives Nothing.Caelith struggles in this world but at the end of the day, He is Nobody, and he has Nothing.

This is the story of a person who transmigrated into a world with a radically different worldview.

So different, in fact, that he is considered a female in that world!

Cheng Nuo: What? Why did you say that I’m female?

Author: You only have one Tintin. The males of this world have two Tintins.

Cheng Nuo: No way! My hands are itchy… I want to cut one off!

- Description from Novelupdates