MTL - Final Priesthood - Chapter 1 martial arts class

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.

Astrid dedicated her life to Leon, believing in their love, their pack, their future. But the devastating return of her sister, Clara, as Leon's destined mate, shatters Astrid's carefully constructed world. Betrayal cuts deep, leaving Astrid stripped bare and forced to confront a horrifying truth: her loyalty was misplaced, her sacrifices meaningless.Just as despair threatens to consume her, Kaeleen, a magnetic and rebellious Alpha from a rival pack, storms into her life, igniting a forbidden passion that challenges everything she thought she knew. He offers her a chance to escape the suffocating control of her past, to claim a life of her own, a life where she is the priority.But Leon won't relinquish his prize so easily. Obsessed and dangerously possessive, he unleashes a storm of violence and manipulation, determined to drag Astrid back into the darkness. Now, Astrid must make a desperate choice: succumb to the chains of her past, or embrace the dangerous allure of a love that could save her... or ignite a war that will consume them all.

Violet skies, a world undergoing massive changes, a deficient moon, interlinking voids…
When the world experienced a cataclysmic event,the majority of living things ceased to exist. Although humanity survived by hiding in the last safe zones, humans had to face mutated dire beasts and colossal source beasts that could break through the space barrier and enter the earth at any second.
Luo Yunyang, a young man who grew up in those calamitous times, obtained an attribute regulator and set out to walk the path of supremacy!

- Description from novelupdates

When the spiritual barrier that has been intact for a hundred years is shattered by a meteor, spiritual energy that had disappeared starts to return.The mystical realm slowly begins its revival—magic, witchcraft, curses, supernatural lifeforms, strange and mysterious legends, monsters and gods from other worlds…The old world order collapses, yet the new order is mystifying and chaotic.Just before the unprecedented reformation is here, Tang Qi awakens and finds himself hung on the cross, having turned into an inferior demon and in great pain and agony…With his special ability to see through the nature of all things from the mystical realm and a sly and crafty mind, follow Tang Qi as he develops new skills and powers—as well as making new friends and allies—to battle and protect himself from never before seen supernatural threats in an unfamiliar world!