Apocalypse: Counterattack of a Cannon Fodder - Chapter 212

The most successful businessman of his time, who started from being a homeless orphan, died indignantly because of being plotted against by his most trusted aid, his own brother.

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.

Sein was only a child when he was abducted from the surface world and forced to join the Black Magic Academy. In the Underworld, strength reigns supreme and the weak struggles to survive. As the death toll of magic initiates continues to rise within the walls of the academy, Sein’s quest for knowledge and power is a constant battle for survival.

Memories of his parents and the starry night sky in the surface world are fading with each passing day in the Underworld.

“Is Magus World the name of the world we live in? Where is my home in the Magus World?” These are the burning questions that Sein has in mind.

Will he be able to rise to the pinnacle of power, discover the truth of the world and ultimately find his way back home?

Official blurb:

He hails from the banished land of the Underworld, bound by a single unforgiving rule—survival of the fittest. He is the seeker of truth, a mage who treads the fine line between sanity and madness. In a world where myths have crumbled and chaos holds sway, it is strength that reigns supreme.

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One day, Zhang Chenfei met a car accident. Fortunately, he didn’t suffer any serious physical injuries. However, due to the impact of the car crash, his brain’s perception of the real world had turned into that of the novel that he was reading prior to the accident. The thing that horrified his wife, Jiao Qi, was… the Smart Brain, Louis XIII downloaded a series of books which meant that his husband would turn into a different character each time!

How will our adorable little wife deal with this kind of husband who seemed to suddenly suffer from multiple personalities?

This novel’s plot focuses on Zhang Chenfei’s changing personality based from the characters in the books, and how his wife, Jiao Qi, deal with every character as he will have to act in sync with whoever his husband’s character is. This is per the advise of the private doctor since treatment of this special condition was still under research.

As they act out their roles, they will gradually discover and learn more about the other, which they’ve never known in their seven years of living together.

- Description from Novelupdates