The Mad Duke's Naughty Maid - Chapter 187: Edit

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.

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

Max died right after beating an impossible level in his favorite RPG, Eldoria's Entry 3.That should have been the end.Instead, he woke up inside the game.In a world where humans do not exist, Max reincarnated as one.With miserable stats and no way to grow like a normal adventurer, he was labeled completely useless from the start.His only saving grace was a unique Rank-SSS skill.Unfortunately, he didn’t really understand how it worked.Before he could figure out how to survive, Max opened his eyes inside a royal castle.It was an elven princess’s birthday.And he was her new pet.----------------------------------------------What To Expect:-NEW CHAPTERS ALL DAYS-A system that isn’t always well explained-Humor of all kinds.-No harem-No R18.-OP MC.-Slice of life moments to slow things down.-Adventure moments filled with danger and tough choices.

The character with the highest difficulty and the worst performance, Baek Yuseol, was considered a trash character in-game because he could not use magic in a fantasy setting where everyone else could.However…[Because the wrong ending has been reached, 90% of Aether World has been destroyed.] [Please reach the “True Ending.”] Suddenly, those words echoed in my mind before I was transmigrated to the Aether World.[You can use the skill “Blink.”] “Just why did I possess this character?”Blink was the only magic skill I had.Surviving in Stella Academy among genius mages, I became the notorious Blink Mage.Alternative title: I Became A Flashing Genius At The Magic Academy