MTL - Card - Chapter 531 Reiko's trouble

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.

“Let me tell you something honey, Revenge is the best dish served cold.’’****To her, betrayal was the most excruciating pain in the world—the kind that pierced her soul.The people she had loved with her entire heart had not only failed her, but ruthlessly deceived her.“How could you?” she had once cried, her voice shaking as she stared at the man she had chased like a madwoman. But he had already cheated on her—expecting a child with the very woman she despised with every fiber of her being.Her so-called “family ” was no better. The relatives she thought she could trust? They only wanted the inheritance meant for her and her little brother.The people who once smiled sweetly and flattered her? They were nowhere to be found when her glamorous and envious life crumbled to nothing.“I thought you all cared about me...” she whispered bitterly, watching as one by one, they all turned their backs on her when she needed them the most.In that devastating moment, everything became painfully clear. The bubble she had lived in popped and she finally saw their true faces.But....it was too late.Everything she had was gone, slipping through her fingers like sand in the wind.Except for him.Her former fiancé, the one man she had tried to ruin with every scheme she had planned, remained by her side until the end. He stood by her, even as she took her final breath.She had accepted her tragic fate—until something phenomenal happened. She woke up once again.Back to the past.Where nothing had happened yet.

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?!