Cosmic Ruler - Chapter 570 Arena IX

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.

Branded as the last remnants of evil.Once known as Cero Restes, now living under the name Gabby Magus walked into villain’s path. He swore to hunt every hero’s affiliated with the Dukedom of South in the kingdom of La Magia.Through a web of lies, manipulation, and ruthless strategy, he will rise—not as a savior, but as the villain hidden within the hero’s party.

[Beef buns: Can effectively replenish physical strength, enhance fitness, and are safe to eat.]Hungry Tain Lin looked at the cow dung in front of him and couldn't help but fall into contemplation.Is this cow dung or a beef bun?To eat, or not to eat? This is a question.

Following the death of his popular online persona, seventeen-year-old Suzuki Mato decides it's time to retire from professional VR gaming. However, his plans are abruptly cut short when he's kidnapped from his high school and forced to be a guinea pig for Genaco Gaming, the world's largest esports and entertainment company. Armed with nothing but his wit and a new online persona, he's thrown headfirst into the virtual reality of “Live No Evil,” a VRMMORPG littered with overpowered bosses, secretive NPCs, and backstabbing gods. His mission? Find a way to conquer this new world and get back at the company that took over his life, all while avoiding 'Parallel' -- a condition that would make it impossible to separate his real and virtual personalities. Because in a world obsessed with VR gaming, Parallel means death, and Suzuki just doesn't have time for that...