Mysterious Awakening - Chapter 5: The Maze

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.

“I will let you be on top from tonight, please don’t divorce me, darling!”-----Evelyn’s fairytale life shattered when a stranger stormed in, claiming to be the real daughter of the Wright family with proof. Her enviable privileges? Stripped away. Her spotless reputation? Tarnished. Her four-year engagement? Abruptly annulled.But the worst betrayal came from her once-loving father, all set to marry her off to settle a business score—with a man twice her age!Everyone in the circle attended this scandalous wedding, eager to witness the downfall of the supposed fake heiress. Yet, the climax was not what even Evelyn had anticipated!Zevian Reign, the nation’s richest tycoon, known for being every woman’s fantasy and the nightmare of all his rivals, made a dramatic entrance. His arrival stunned the guests, but his brazen wish was even more startling! He casually demanded to replace the groom and marry the beautiful bride.No one dared to challenge, nor did anyone have the guts to disobey him. They were left with no choice but to watch the wedding unfold.And it was Evelyn’s time to smirk, for she was now the devil’s wife. And all those who had ruined her, they would pay back in tenfold!++++[Excerpt]“Why would I ditch my husband for a loser?” Evelyn chuckled, crossing her arms defiantly. “He is better than him in all the aspects.” Her gaze drifted to her ex-fiancé nearby, and she continued with a smirk, “Actually, a lot better in bed.”As Annabelle’s face flushed with disdain, Evelyn patted her back and leaned in to deliver another slap. “So, good luck with licking my leftovers, dear step-sister. He's a perfect match for you.”

She is the legend of the Heavenly Soul Alliance, the king of mercenaries with a perverse personality, the world’s number one head reward, she closed her eyes unwillingly in a conspiracy, but opened her eyes in the mountain of corpses in another world, when he met her , he knew at a glance that she was the love disaster of his life, he was unwilling to resolve it, and held her in the palm of his hand, and accidentally spoiled her to the sky, shocking the three worlds.

“Your Majesty, it’s too bad. Your Majesty led tens of thousands of soldiers to level the Shuize Empire and smashed the dragon’s Nilin one by one!”

Without raising his head, a certain person said two words softly, “Follow her!”

“Your Majesty, it’s not good again. The empress is too handsome in a golden armored uniform, and she was thrown down by the goddess of Luoshui as a man!”

A certain person with a face full of black lines, gritted his teeth, flew out, grabbed the goddess and threw it back, half-fading the golden armor, hugged the lazy and handsome boy tightly in his arms, and said with a gloomy face, “See clearly before rushing, She’s a woman!”

The Goddess spoke weakly, “I don’t mind her gender, I love her for who she is!”

Someone was murderous, “I don’t mind, she is my woman!”

- Description from novelbuddy