I regressed and became the Sword Ice King - Chapter 326 - - Festival 57- Mila attacks the King

Ryo Tanaka, a struggling college student, works tirelessly at multiple part-time jobs to make ends meet. In a bid to earn some extra cash, he volunteers for a paid drug research study, unaware that it will alter the course of his life forever.The experiment takes a disastrous turn, leaving Ryo bedridden with a high fever for several days. But when he finally awakens, he finds himself in a world plunged into chaos. A deadly virus has ravaged the city, turning its inhabitants into ravenous, flesh-eating zombies. Streets once bustling with life now lay desolate, the remnants of civilization crumbling under the weight of the apocalypse.

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.

“You mean that Prince Yu wants to marry me?”

“Exactly, young master, Prince Yu wants to marry you!”

“Hell no! Is he out of his mind? Even if woman is a rare species nowadays, as the prince, he could have a chance to marry one. Is it because he got excluded, or maybe he has sexual impotence, so he could only marry a man?”

“No, Prince Yu is charming, majestic, endowed with civil and martial virtues, and also in perfect health.”

“Then why would he marry me?”

“Maybe because of your reputation out there.”

“Reputation? Am I quite famous?”

“Of course. Young master, you’re far-famed.”

“Really? What did they say about me?”

“They said you are ugly, good-for-nothing, short-lived, a freak, with no morals, and shameless…”

…

- Description from Novelupdates

“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.