Martial Online. - Chapter 473 All-Online

After her life ended, Nan Fei Yu was bonded to a Villain System. In order to complete the system’s tasks as soon as possible and reshape her body, she became a villain that everyone hated. Everyone wanted her to die! However, if the villain was delicate and soft, did it bring an alluring hallo?

- Description from Novelupdates

After an accidental electrocution, Zhang Yi realized he could hide his body and become an invisible man. That incident marked a new chapter in his life. The magnificent president of the company, the hot policewoman, and the mischievous daughter of a rich man.“Apologies. I'm a righteous man. I've never abused my power of turning invisible to creep on beautiful girls, because I'd only stand boldly before them to look at them! You can't see me. You can't see me. You can't see me…”

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.

They stole his future and crippled his body. Now, he’ll rewrite the history in blood.Damon was on the verge of greatness—first in line to claim Bloodreign, the legendary artifact said to grant unmatched power in Earth Online, the world’s first fully immersive VR game. But his best friend betrayed him, stealing the item, and leaving Damon broken, crippled and nearly deleted. Kicked from the guild, mocked by the community, and trapped in a weak, crippled body, he was forgotten until his last desperate attempt somehow brought him back in time to the day when it all began.Now Damon was back and he knew what he was going after.A hidden lineage. A cursed class. A bloodline sealed since the dawn of the multiverse.Last time he played fair. Last time he trusted. This time he would hunt and devour. With years of knowledge of every exploit, every secret quest, every bugged mechanic, he will climb straight to the top. Armed with the blood of the first Vampire King, he was an apex predator now who stood at the very top.However, unbeknownst to him, a catastrophe lurks in the shadows. Damon finds out that the game itself might not be as simple as it seemed and the entire future of the humanity might depend on this game.