MTL - Harry Potter: Hello the Dark Lord - v3 Chapter 243 I can't figure it out with our pig brains

He possessed the Xuan Gate Medical Arts and had fortuitously obtained a heaven-defying Spiritual Treasure!

I had thought that my life couldn’t get worse when I walked in on my fiancé cheating on me with my best friend. But after a series of unfortunate events, I opened my eyes in a world that I had only read about in a webnovel, the Erudian Empire, ruled under the domineering, bloody reign of Emperor Helio.

The worst part?

I’m not even the main character! Reborn as Winter Royberg de la Erudian, I am the pitiful side character who is discovered to be a royal bastard princess due to a certain physical trait only the imperial bloodline possesses. But I know the end of Winter’s story and the unwanted royal punching bag is framed as a witch and killed at age 16 on the guillotine due to the scheming of the cruel empress.

An aloof, murder happy father? Check.

Psycho half-sister? Check.

Meddlesome author who wants me to follow the script? Double check!

I don’t want to die an early death again, so I’m determined not to ever be discovered as a royal again. But before I know it, I’m trapped in a palace of blood and opulence playing tricky games of power, games I have no clue how to win. How will I survive to adulthood in the imperial palace and get my happily ever after? And am I really the only person who fell into this world?

Lin Xiao was addicted to reading Qidian novels. He always fantasized that he would have a day when he could transmigrate and then embrace beautiful women all over the whole world, becoming the strongest person in the mainland.

After he really transmigrated, Lin Xiao stubbornly always believed that he was a protagonist until he met Ling Luo.

Only after being killed by Ling Luo did he know that he was only a cannon fodder villain in a novel.

When he restarted his life and hatefully wanted to oppose his fate at least once, he was ruthlessly crushed again.

Okay then… since a protagonist was determined to be like this, he wouldn’t oppose a protagonist anymore…

The two of them were similarly straight guys…

When he restarted his life again, Ling Luo unexpectedly suffered an Love Herb’s poison…

Lin Xiao internally cried as he looked at a certain person who tied him onto an obelisk in the back and thought, who could tell him what this was all about?

- 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.