MTL - The Queen’s Gigolo - Chapter 57

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.

One of the world’s top killer who was fed up with his life tried to retire and live as a security guard at Jiang Yuan University. He only wanted to adapt to the life of an ordinary citizen and blend into the society. However, he didn’t expect that a random encounter with a beautiful girl, who was also the prettiest girl in the university, will become the key to a fierce pursuit, and at the same time, all kind of beautiful women, as well as powerful enemies came into his life.

Let’s watch over the journey of this Versatile Security Guard. Let’s see how he will obtain various beautiful flowers and eliminate his enemies and step on the head of powerful villains.

I only wanted to be a small security guard, Xu Taping said while lying in the lap of a beautiful flower.

- Description from Novelupdates

A s*ave boy, Ram, who assassinated an enemy commander to end a war.Jedrik, the great chieftain of the North.Demion, the prince of the South.Charlon, the duke’s daughter.The blood oath they forged plunges a seemingly ended war back into chaos.

A human warrior cultivating the Ancient Strengthening Technique has transcended dimensions and arrived on Kyushu. Together with twelve ravishing beauties with looks that were unmatched in their generation, will he be able to stand on the summit of this world?