Love Rival Romance System - Chapter 29 - Ear Piercing

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.

My dream will come true! Soon I will be arriving in Italy and appearing at the Milan Fashion Show! My photos will be published in all fashion magazines around the world!

In the end, all my sacrifices and hard work will not be in vain!

But why my dream become a nightmare!? Daddy suddenly invited me to meet a young CEO who was really arrogant. He said, for the sake of my family's business, I will become his future wife of the young CEO!

I don't want to marry him! I don't even know, and don’t love him, but now I have to sacrifice my dream to become his housewife!?

What about my dream? Are my efforts and sacrifices in vain? What does the world's most arrogant CEO want? Does he think money can buy love?

Elena, who spent her entire life as a cold-blooded female knight to avenge her family, ended up dying without claiming her revenge. When she opened her eyes she found that she went back into the past. By day she was a lady in a dress, and at night she carried a sword to change history and prevent her family’s destruction.