The Hero's System: Return of an Extra Villain - Chapter 7 - 6 - Madam Fleur

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.

Heaven and Earth serve as the guesthouse for all living things, with Time being the sojourner since time immemorial.

As with the difference between dreaming and awakening, the distinction between life and death is diverse and confused, and changing.

What awaits us beyond time, once we have transcended life and death, heaven and earth?

After his tragic life ended, Aleron expected to reincarnate or transmigrate, but instead, he was transported with his body and summoned as a hero...only to enter a new hell as he had trash stats and couldn't activate his Divine Blessing, prompting the King to extract his boon.He was tortured and onward to being buried alive with his soul ravaged after they removed his Divine Blessing. But all was not lost as Aleron found he had the Ultimate Gacha System at the death's door and initiated his first summon in the Lords of Arcane banner.[Congratulations! You have summoned Darzax the Graveborn, the Sorcerer of Death and Necromancy.]

Ethan was betrayed, he was broken, left crippled by those he trusted most: Zachary and Ivy, the people who ruined his life. Stripped of everything, Ethan crawled through three grueling years in the abandoned depths of despair, desperate to regain what he lost.Until one final act of defiance opened the door to something greater.When Ethan completed a hidden quest, fate granted him a miraculous reward: a second chance.He awakens years in the past, on the eve of a revolution: the launch of Ethereal, the world's first fully immersive VR game and humanity’s obsession. Armed with memories of four years in Ethereal, he’s no longer the helpless pawn who lost everything.This time, Ethan knows every secret, every hidden quest, every exploit to climb back to the top. But when he steps into the game, the system unveils a shocking twist: a divine bloodline, legendary abilities, and a class no one believed could dominate.Ethan vows to rise once more, but this time, he knows where the paths of glory begin, where betrayal lurks, and where to find legendary treasures that will crown him king in this brutal new world.The stakes are higher than ever. Factions are forming, alliances are shattering, and the clock ticks toward an event that will rewrite reality itself.The weak will perish, and the strong will thrive.They betrayed him once.They won’t live to do it again.