Demon's Diary - Chapter 8 – Purple-Clothed Maiden

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.

Chang An, capital of Tang, the most powerful empire in the continent. A heaven wrecking massacre shook the city to its core. Amidst the incident, a young boy named Ning Que managed to get away, dug out from a pile of corpses along with a little girl called Sang Sang. Years passed, and since that day the two of them lived together. Together with Sang Sang they both entered the military, with plausible military achievements, they were recommended into the Scholar School, which began their miraculous journey.

A man betrayed by a comrade dies a wretched death as a third rate swordsman. His existence, his life, his emotions are all a nuisance in the eyes of society. But wait… What’s this green skin? Reincarnated as a goblin? Wait, I went back in time as well?

It has been six years since the game to decide the world’s fate began. The strongest player, Hero King Kang Yoosung, who has never lost his first place as the top ranker, greets a new season. “It was… over for me a f*cking long time ago. I’m just doing this for the money.“ [Provocation stat increasing exponentially!] [The Clown Lord expresses satisfaction with contractor’s behavior!] The survival journey of a player with insane talent begins now!