MTL - Supreme Demon - Chapter 3459 The first ancient secret!

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.

Apocalypse befell, and roommates performed a skyward ritual.As the fog descended, the Book of Blood Spirit appeared in the hands of all survivors, and only those with a Contract monster could survive.Su Han directed his gaze to the neighbor who had already mutated and twisted, silently pulling out a gleaming fruit knife...Grotesque meat corpses, giant spiders with gaping mouths, eyeballs enveloping the city, one-eyed sharp-toothed hand monsters...Civilization fell, cities shattered, and all humans became meat for the monsters. There was only one way to survive:Use monsters to fight monsters.

After his fall, the Duke who was distant with his wife and daughter recalled his memories of another world. With a new perspective on life, he swore to cherish and protect those two.

A person cut down the road of life in troubled times.

Zombie: Roar.

Lin Fan: “Everyone is a neighbor, so why are you so irritable?”

Lin Fan: “I still have to go grocery shopping.”

Lin Fan looked at Xiaoqing who had turned into a zombie: “Xiaoqing, I bought a few bottles of water and have already scanned the code.”

Lin Fan: “Boss, I want to settle the salary.”

Sunshine Community, where Lin Fan lives, countless refugees flocked to seek shelter.

We have to learn from Lin Fan, abide by the law, work part-time to earn money, strive to buy a house and a car, and be an excellent citizen in a city where zombies are rampant.

- Description from novelbuddy