Jujutsushi Wa Yuusha Ni Narenai - Chapter 87: The Palace Zone

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.

In the presence of strangers, Han Chen was always handsome and cold, making it difficult for others to get close to him. He was like the frosted snow – pure, and slightly chilly. Yet, he was also like the river flowing in the dark night – quiet and moving. To many, he was akin to an unparalleled and untouchable god.

Only in the presence of Bai Jin Xi would this famous top police superintendent expose his deeply hidden shameless nature.

“Come and sit nearer to me, I won’t eat you. At least, not now.”

“I have never touched other women before. Do you want to check my body?”

“Bai Jin Xi, never ever leave my side. Every year, every month, every moment, every minute, every second.”

In her heart, there exists an obstinate old man – one who has tirelessly loved her throughout all these years.

I lived my whole life as a s*ave, bound by a leash. But there was one thing that I was able to choose for myself: the place where I would die.“…Any last words?”My only friend asked me in a calm voice, and I quietly replied as I closed my eyes.“Waaaah!”…Waaaah?To cut to the chase, I was reincarnated. And not just as anyone, but as my friend’s youngest grandson. So, what am I going to do now? Well, what else can I do?“I’m going to cause chaos.”

The last thing Ariel expected after a weekend of binge reading was to be transmigrated into the same novel as the evil secretary who was bound to be eliminated.“It's okay, I can just disappear from the main story line and live a peaceful life.”However her hopes were shattered when a system barged into her mind and pushed her to fulfil the dead secretary wishes. The top one, capture the male lead.As she saw the formidable man sitting in his office chair with leisure, the full time student Ariel who never had an experience wirh boys thought with dismay.'This is going to be a difficult task.'However, it was this or deathSo she plunged into the journey of seducing the male lead, unaware that once she gained his attention no one would be able to save her from his clutches......Transmigration. System. Multiple Love Interests with a focus on the alpha lead. Possessive, alpha Male Lead and lots of face slapping. Fast-paced.