I'll Retire After Saving the World - Chapter 21 - Basement’s 5th Floor (4)

Tang Feng had been just an ordinary milk tea shop employee before one day, the lady boss called him to her room, and he learned what “hidden rules” really meant...

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.

The era of the great pirates.

The sea is surging, the strong are destroying the sky and the earth, and they are fighting each other. It really makes people——

Can’t get up!

I, Rusilu Cullo, twenty-four years old, my biggest dream:

Live this life safely!

- Description from novelbuddy

Darkness’ devouring energy and mysterious space energy.

The two different types of energy appeared in one person.

A glance that can kill? That is the power of space.

Men will be r*ped by beautiful women?

That is the fate of the protagonist?

In a world with Special powers, Vampires, Witches and Demons,

where the forces of Darkness and Light collides.

His women will be his guiding lights and change his fate!

– from eveningBoat

- Description from Novelupdates