Immortality Cultivation: I Farm in the System Space - Chapter 37 - Purchasing Talismans, Going to the Black Market

“But he is a good man,” she argued to see his eyes narrow at her words.

This is the story of a person who transmigrated into a world with a radically different worldview.

So different, in fact, that he is considered a female in that world!

Cheng Nuo: What? Why did you say that I’m female?

Author: You only have one Tintin. The males of this world have two Tintins.

Cheng Nuo: No way! My hands are itchy… I want to cut one off!

- Description from Novelupdates

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.

“I have repeatedly emphasized that the atmosphere in the world of cultivating immortals is inherently crooked. I didn’t bring it crooked. It is said that the history books are written by the victors, so why do people always frame me when I win?” Lu Yang Jianxian said in an interview with reporters. , expressing great anger.

the next day.

“I have repeatedly emphasized that the atmosphere in the world of cultivating immortals is caused by me.” Lu Yang Jianxian said in an interview with reporters, expressing his anger. ——”Xiu Xian Daily” reports for you.

- Description from novelbuddy