MTL - Poisoning the World: The Secret Service Mysterious Doctor is a Young Beastly Wife - Chapter 2989 Hug together

Seol Woon-hwi, the Blood Heaven’s Righteous Blade, rose to power, becoming second to none under the heavens, reigning just beneath the sky itself.Yet, at the height of absolute power, he finds himself returned to his past—back to his days as the scorned illegitimate child of the Everlasting Snow Palace.

Juvenile Qin Chen, the star gate was taken, repaired as abolished, but it was awakened to the memory of the nine ninth, and opened the tenth journey of the sky. Wanjie is a book, I write a pen and write a thousand worlds. The hundred fields are mountains, my heart is the sea, and I walk out of the heavens. Hand Optimus, foot on the ground, this world, I am the emperor, who, dare not to accept?

- Description from sobiquge.com

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.

Standing last among those sailors, Byron was shoved roughly onto that narrow gangplank by the pirates.Just a short distance beneath his feet churned blood-steeped waves and dozens of gaping mouths filled with sharp teeth!“Thud.”He could only watch helplessly as the sharks opened their mouths, stirring up turbulent currents in the ocean as they bit viciously towards him!However, the [Sailing Logbook] formed before his eyes and wrote furiously on its own:“The ancient blood of the Bayfolk within you begins to boil.Spiritual sublimation commences!”