The Cannon Fodder and Her Mr. Right - Chapter 1283 - : The Battle of the Three Kingdoms

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.

Inexplicably reborn in the year 2003, having failed terribly in his previous life, the prevailing concern with Xu Tingsheng, that stands above all else, is none other than her. But alas, he is just months away from entering university, while she is but in her first year of junior high… Regarding this, all he can do is wait silently…for now.

BlurbKira is an Omega treated badly by her pack. She has always been seen as weak and useless. On Alpha Asher’s birthday, she finds out she is his mate, but he rejects her and chooses his mistress, Mira, instead. Humiliated and blamed for something she didn’t do, Kira is thrown out of the pack.Alone and heartbroken, Kira runs into the forest and meets Alpha Ryker, the leader of a pack with a scary reputation. But Ryker is not what she expected. He helps her grow stronger and shows her kindness she has never known. Kira also discovers she has special powers and is part of a prophecy that could save or destroy all werewolves.Now, Alpha Asher wants Kira back, but Ryker has already captured her heart. As war looms, Kira must choose between Ryker, who believes in her, and Asher, who regrets his mistakes. Her decision will decide the future of the packs and her own destiny.Will Kira rise above her past and become a leader, or will she let others decide her fate?

“Welcome to Perfect Life Simulator!”

“You can choose to simulate your own life or someone else’s life to find solutions to many life problems!”

…

A watch handed down from his deceased parents allowed Su Wu to start a future life simulator.

He thought that he could really use this simulator to lead a perfect life without regrets, but unexpectedly things developed in another direction.

In the future, as long as there is light, there will be evil spirits that kill people;

Hanging in the sky and covering a city, it leaves a city without red lanterns of living people;

The scarlet eye that can use a mobile phone to spy on the specific location of others…

Will such a future really come?

…

“you are dead.”

“This simulation is over.”

- Description from novelbuddy