First Assistant's Petite Wife Has Space - Chapter 339 - : Both were Restless

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.

There are always four kinds of people in the traditional Mary Sue world. The Male Lead, the Mary Sue female lead, the woman who never wanted to see the female protagonist live a good life, and the infatuated man willing to destroy heaven and earth to get the female lead.

A wonder falling down from heaven! A boy possessed by strange blood! Gods tremble! Demons flee! A boy from the land of Dong Zhou. A pink skull as his sworn friend until death. A story of a determined warrior struggling for power. A legend that shakes the galaxy and disturbs the worlds of god, demon and man.

Su Bai, who entered the horror game, obtained all-professional talents, which could light up the underworld professions.

Ghost teacher, ghost doctor, ghost psychologist, ghost painter, ghost massage therapist…

“Miss, please get dressed, I’m your teacher, don’t be shy.”

In the vampire castle, Su Bai said solemnly to a vampire girl.

“Beauty, please don’t worry, the doctor’s eyes don’t distinguish between men and women.”

In the Necronomicon Hospital, Su Bai, who was doing a gynecological examination to a glamorous female zombie, said solemnly.

“Madam, please respect my profession, I am a painter, I only sell my art, not my body…”

In the Devil’s Manor, Su Bai had some headaches. No matter what profession he chose, his charm value was full.

Even driving a taxi is molested by female ghosts.

Can you still play the game? …

- Description from novelbuddy