The Great Merchant in the Cataclysm - Chapter 142 - Snooping Secretly

The world ended.Zombies and monsters rose. Cities crumbled.And Merek? He woke up in the apocalypse with a job that lets him create armor for lingering souls—spirits without bodies, desperate for purpose.Turns out, the dead don’t rest easy. Some are angry. Some vengeful. Others? Just lost. When Merek binds them into steel warframes, they don’t just fight... they evolve.Now, he leads a legion of the undead—ghosts in armor, bound to him by oath and fate.Faction leaders call him mad. Warlords want him dead. And God? If He’s watching, He’s not talking.Merek was supposed to die with everyone else.Instead, he got a support type job no one’s heard of... and a shot at rewriting his pathetic Earth-life.In this world, only the fittest survive.And Merek? He’s got undeads in steel at his side.

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.

An Hao leaped, thinking she had died, but to her surprise, when she opened her eyes, she found herself back in the year 1985. To live a second life, did she have to endure the abuse of her stepmother and stepsister again, the dislike of her mother-in-law and disdain from her sister-in-law, and the betrayal of her best friend who bravely became the other woman just to slap her in the face and climb the social ladder? Was she supposed to end her miserable life in poverty again? An Hao's answer was, “Eat! Shit! No!” She was determined to make something of herself, to get rich by capitalizing on her knowledge and aim for a well-off life. This time around, she was going to be the protective big sister who reformed her worthless little brother who had died a wretched death, and the virtuous wife to make up for her past neglect of her husband! She wouldn't let this life go to waste in despair! A malicious best friend? Coveting her man? Not a chance! Go hang out wherever it's cool! Cough cough, how did she not realize in her past life that this “Stoic King of Hell” was so indecent. Decent? You've had your fill of decency during the day.

He Miao transmigrated into a book, becoming the ugly, foolish female supporting character who behaved crudely, no thanks to being raised in a village. She kept hovering around the male lead and eventually provoked the female lead, who had a System, and was cheated into losing her company shares. Her own father married her off to a violent, abusive husband, and she ended her life as cannon fodder due to one of his violent fits. To avoid that tragic end, He Miao made two choices. The first was to escape the He family as soon as possible, while the second was…

Asking the male lead out for a meeting, she told him, “I don’t love you anymore. Let’s annul our engagement.” Jing Yan, who was still racking his brains on how he could get away from her annoying presence, exclaimed, “Are you serious?”Seeing that he was distrustful, He Miao took out the engagement gifts and stuffed them into his hands, ignoring his scornful reaction as she turned to leave. The annulled engagement meant half of her previous tragic fate was avoided, which improved her mood considerably. Hugging the little dog she adopted, she peppered it with kisses in her cheerful spirit, ignoring the fact that it stiffened in her arms…

Still, it started to act weird recently as it would run circles around her in the morning while throwing a fuss at night and trying to run outside, even succeeding a few times. He Miao consulted many veterinarians and experts on the matter, but she did not know that the dog’s rebellious attitude was because Jing Yan’s soul had transmigrated into it! Everyone knows that Jing Yan’s fiancee is an ugly, stupid, annoying village bumpkin who bugged him every day.

But she was at least tactful enough to annul their engagement. And yet, the same Jing Yan who had always acted high and mighty knelt in front of a fairy-like girl to help her put on her shoes as he asked unhappily, “It’s already been so long… Can we get engaged again already?”Everyone stared blankly, dumbstruck. Wasn’t his fiancee supposed to be ugly and stupid? She’s clearly enchantingly beautiful! Who spread those rumors in the first place?!