21st century Goguryeo - Chapter 224

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled…. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.

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.

Bai Yuxue floated in the world for decades as a soul, and was reborn once.

Excited, she immediately hugged the baby girl in her arms: “I just want to take my daughter to be beautiful alone!”

In difficult times, she lived in poverty and lacked food and clothing. She was an orphan, a widow, and a mother without support. Can anyone step on it?

Don’t be afraid, there is a simulated ranch management space that you bring with you. Move your fingers, make a fortune, and get rich again, and you can’t climb high in the blink of an eye.

Since then, Bai Yuxue has set a small goal for herself: to make her daughter’s daughter fat and happy as quickly as possible.

But, where did this man come from?

Bai Yuxue: “Sir, my man is already dead, don’t try to pretend.”

Someone: “Because I miss you, I borrowed from the King of Hell for another lifetime.”

Through the wind and rain, overcoming thorns and thorns, just to hold you in my arms again.

Bai Yuxue: “Well, let me slow down first.”

Little girl: “I hate you, don’t rob my mother from me!”

- Description from novelbuddy