21st century Goguryeo - Chapter 530 - Season 2 Book 21 Shadow of War 2 - 4-2 Follow-up Measures for New China

After sleeping for over two thousand years, she woke up, only to find she had lost everything and was even going to be sold at an auction by her father.On her way to escape, she met him by chance. He was so handsome and adorable, like a cute little dog. So they got married in a flash.Later, she accidentally met the first interstellar commander whose mask had fallen off. Rumor has it that anyone who sees his true face will die. She trembled with fear, “What a coincidence! You look exactly like my husband!” He said, “I am your husband.”From then on, he clung to her every day, wanting to have a child. She felt regretful: He looks like a wolf now! She misses the little puppy she used to have so much...

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

- Description from Novelupdates

When Cheng Qianfan opens his eyes every day, the first reaction in his mind is: What is my identity today (which vest should I wear)?

This book is also known as “Ace Agent: My Vests Are Countless”.

The red ‘flame’ hidden deep inside the enemy, the agile and outstanding member of the red team ‘Chen Zhou’, the favorite general of the military commander Dai Chunfeng, the blue bird… and so on.

However, he knew that he was Cheng Qianfan, a staunch red warrior!

“In the dark, you firmly watch the sun in your heart; in the long night, you silently give birth to the dawn of dawn; in the tiger’s den, you bear the burden of humiliation and wait for the time; in the battle, you rise quietly, killing the enemy invisible; no one knows your name , your feats will be immortal…”

His story begins in the early spring of 1936…

- Description from novelbuddy

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.