Reincarnated! My Parents and Brothers Beg for My Forgiveness - Chapter 956 - : What If Something Had Happened

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.

Travel across different worlds and become a fallen aristocratic lord. With the help of the proficiency panel, you can start your liver experience with the ancestral knight breathing method, follow the wizard’s footsteps step by step, and embark on a bizarre and mysterious journey.

- Description from novelbuddy

Vampire Queen Shang Yu awoke at the auction house after a ten billion bid for her corpse.A gunfight broke out during transport and she stood up from her coffin.The scent of blood in the air was truly delightful!Her eyes fell upon the injured man and she tilted his chin, lightly kissing his wound:“You taste sweet.”…It’s said Shang Yu’s meteoric rise relied on men, but deeper digging revealed her aliases were all shocking, plus nine elder brothers and sisters who doted on her.She was known as the business world’s foremost abstinent queen.Yet she was photographed eagerly pressing a certain tycoon in a car, kissing him as he let her have her way.