Eternally Regressing Knight - Chapter 518 - Those with Dreams Helping Others with Dreams

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.

The dead broke small streamer Zong Qi received a random message one day.

Zong Qi: ? tr*sh commercial, deleted

That night, he got pulled onto the set of a horror film and was informed that if he didn’t shoot it… He’ll die.

He was lucky that the actors were all working as hard as they could, and the director only needed to stand around and watch the show.

But because he had been given way too much, Zong Qi didn’t hesitate at all before making his own changes.

Under his false identity was an ‘evil mastermind’ that fought with the actors on everything.

The immoral things he’s done on set include but aren’t limited to–

Personally putting makeup on the ghost, teaching actors how to mess and change the script, switching ‘sides’ at crucial times…

People as arrogant as him usually don’t have good endings when their identities were revealed.

What Zong Qi didn’t expect was that instead of the actors joining up for revenge, an unlucky bastard’s whose plans had been spoilt by him countless times appeared instead.

The man took off his glasses, revealing a pair of closed eyes, his face beautiful and cold.

The brush dipped in paint hooked past the young man’s neck, full of danger.

“You dirtied my brush.”

He smirked, drawling, “As punishment, I’ll dirty you.”

- Description from Novelupdates

Until he became the lowest-ranked master, his lonely and luckless life never changed.

Suddenly one day, a descendant injected him with a nanomachine, and the machine started ‘speaking’ to him.

“What? What are you talking about?”

This was beyond the boy’s knowledge, he turned pale.

The Nanomachine linked to his cerebrum realized the User was not understanding a single word it said.

“Who are you, and why are you doing this to me?”

“Nano Mashin?”

The boy’s face hardened.

Mashin was the deity the Mashin Religion worshipped, along with the Sacred Fire.

The religions’ Master communicated with Mashin.

“Um, are you really Mashin?”

The boy knelt down and asked with a trembling voice. At this, the Nanomachine attached to his cerebrum realized it had been misunderstood.

Crossing to One Piece world, he became Roger’s younger brother.

Unexpectedly, Gol-D-Roger who was in his fifties had a teenage brother. But he was so weak.

Fortunately, at the age of sixteen, he actually found himself with a possession soul system.

He had attached to the master IP man, also to the White Phoenix and to Ge Nie with his strong ability of the Hundred Step Flying Sword.

If you think that he can only Purchase these? Then you’re wrong!

Pain, Itachi, Ichigo Kurosaki, as long as there is money, any soul can be Purchased.

- Description from Novelupdates