MTL - Space Speed Xing Hen - Chapter 3 Space abilities of the sky mark (top)

Tian Man Continent is a world of martial arts. A young boy named “Su Yi” led countless yao (monsters or demons) and overrode countless families who had thousands of years of history. He rose abruptly in the world as the brightest star in the sky. He married beauties and walked towards the peak of of the world, and finally ascended onto the thrones of the ancient gods!

- Description from novelupdates

A tale about the former leader of a special organization that served under royalty, now leaving his past life behind and unintentionally getting involved with the martial world.

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.

“Ryan was transported to a world of swords and magic, and he discovered that he was contracted with a system that made him stronger as long as he continued to practice basic magic!

When everyone else was learning all sorts of fancy magic, Ryan was keeping a low profile practicing foundational magic!

“Ding! Congratulations to master for completing foundational magic training 10 000 times. You obtained [Spell Casting Speed X10]!”

“Ding! Congratulations to master for completing foundational magic training 100 000 times. You obtained [Complete Fire Elemental Magic]!”

“Ding! Congratulations to master for completing one million times of blade-drawing. You obtained [Domain of the Laws of Magic, Saint Mage Rank]!”

Thus, after practicing foundational magic for billions of times, when Ryan unleashed his foundational magic, he realized that no one could rival him!”