Heavenly Castle - Chapter 45 - Fleida Emperor

Great Cultivator Chen Fan had failed his Tribulation period, but after a dream, he had returned to Earth, when he was young, five hundred years ago.

“In my past life, I reached the peak in the universe. I looked down upon the myriad of worlds, but with no one accompanying me. In this life, I wish for both.”

- Description from novelupdates

Lin Shuang, just a bar waiter, started off by bullying a billionaire heiress. What to do? He was in such a panic! She investigated him every day.And there were hordes of rich rivals threatening him...If this continued, he genuinely feared his identity as the leader of the Netherworld Army would be exposed...

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.

“You are sitted with the devil... and you are afraid of a demon:”Daxen, a brilliant but bad-minded young boy, finds himself in a parallel world where everything seems to be linked with havoc.At first, he thought he was dreaming, that his mind was playing tricks on him. But not until it had dawned on him.Growing up, Daxen believed the world belonged to the strong, because he had always been at the mercy of bullies. Constantly beaten, mocked, and pushed aside, he began to lose faith in kindness.Over time, his heart hardened. He stopped caring. He developed a cold, calculating mindset, one that thrived on revenge. Pain; once something he feared, became something he delivered.Especially to bullies.He started learning how to play smart, how to always pay back, how to get revenge in a cold way. His feelings for when someone is in pain died, since he now draws pleasure in giving pain to bullies.Mercy faded from his heart, replaced with a twisted satisfaction in seeing his tormentors suffer.But something had happened. He had been assessed and was picked to join a force to defend his world.How can someone as bad-minded as he is do that?Still, the choice was made. And now, Daxen must fight. Train. Endure brutal trials to grow stronger, to survive, to rank up and eventually, defend his world, and himself.But the path wasn’t easy. The trials were something else, merciless. The journey tested his very soul. It made him do things, think things, see things that weren’t sensible to any mere being.He had to slay what he never believed existed, to him they were bullies of the bullies and that was what he hated the most.But as he advanced, he changed. With each step he became a better version of what he was, a darker version, some might call it an omen, a bad one.For He became…Read to find out.