The Terminally Ill Young Master is the Mad Dog of the Underworld - Chapter 181

When I was reborn in South Korea, I wanted to live my life in peace. Pass the activation system, unlock the 'Big Brother' career, obtain the invincible system, and embark on the road to power

I just shut the door, why should I kill the devil.

No, I need a demon hunter, Dante, it’s up to you.

Cultists, demons, traitors, and even fanatics, it seems that there are too many things to cut. This world needs justice, and now justice is angry.

(Mainly the PF system, and then the Pathfinder Wrath of Righteous mod. Note that mods are not games.)

(In the end, all the dice in this novel use real dice, not dice girls, nor set by myself.)

- Description from novelbuddy

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.