Death… And Me - Chapter 1862: The Probable Barriers' Problem

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

When the sword awakens, its slept so long that it has forgotten everything but hunger. It is a weapon made to feast on death and blood, and the more bodies that it leaves in its wake, the stronger it gets. Bloodstained Blade is a fantasy gamelit, where the main character is the blade, and not the person wielding it. So, expect the wielder of the blade to die occasionally and be replaced with another man or monster as the Ebon Blade pursues its own goals no matter the cost. Expect: Daily updates, new powers and abilities, numbers to go up, violence, and revenge.

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.

Alex, a young man with ambition but unfortunate life.He grew up as an orphan and from a very young age, learned to stand on his own feet.Barely making a living by searching through the dumpsite for things that could be sold.One day, when he came back home from the dumpsite, Alex decided to rest on the new sofa that he got from the dumpsite just the other day.But unexpectedly something magical happened to him.A stone inlaid on the sofa suddenly brought him to an alternate dimension!And there, Alex rise started, controlling the luck of the world.Everything runs through his favor.Whenever a problem comes up, it gets solve unknowingly.When he lacks money, gold suddenly fell down from the sky.Opening a treasure chest will always give great rewards.Lottery is nonsense, he will win no matter what.When a strong monster is about to kill him, it will trip on a rock and have its head explode, dying by itself.That's how against the sky he is!From then on, Alex became known as 'Fortune', the one who controls luck!