The Way of a Demon Lord - Chapter 12: Initiation

She regards him as an elder, respects him and esteems him; he cherishes her to the core, loves her deeply, and spoils and protects her—Shi Nuan married Song Yansheng, the business legend of T City, and this man was once her fiancé's Second Uncle!One day, Shi Nuan invited friends to her home.Friend: “Nuannuan, Mr. Song takes such good care of you, I'm so envious!”Shi Nuan blushed: “It's all for show, in private he's... quite indifferent to me!”That night, Song Yansheng embraced his little wife, his voice magnetic: “I heard you feel I'm indifferent to you?”Shi Nuan: “...”[Heartwarming true love, deep affections not too late, an uncle-loving story with an eight-year age gap, guaranteed quality. Recommended past works: 'World's Deepest Love', 'First Warm Marriage of the Noble Family', 'First Marriage of the Rich', new book 'Mr. Gu, You're Missing 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.

With a sword in hand and wine in tow, he roams the martial world; her slender waist is light as a feather in his palm.The young man strides forward with a long blade slung over his shoulder and a flask at his side, yet the world of martial arts he seeks remains elusive.As the chaotic world book turns a new page, decades of relentless nights in the martial world pass by.Suddenly, he looks back and finds he has already shattered the mortal realm.

“There are no heroes. In life, the monsters win.”

...

In 2106, [Mayhem Online], a fully immersive VRMMO game, was released. Soon, it dominated the world's economy when people could exchange the in-game currency with real-life currency and vice versa.

In the year 2107, Flynn Grey, a 22-year-old college dropout with an ambiguous history, joined in the fray of billions of people that had already started playing [Mayhem]. Hoping to uncover the game's secret and earn a fortune, he spent months on adventures without fruitful results.

For better or worse, Shura, Flynn's in-game character, ends up in a great Wyvern's den, acquiring a hidden class and a monstrous race. Join him as he defeats his past and paves his way into becoming a true legend in both worlds.