Reincarnated as a demon inside a dungeon - Chapter 68

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.

I transmigrated into the world of an urban novel.Bai Zhou couldn’t help but complain: “Why is it that other people either become the protagonist or the big villain, and I end up as a small lackey under a villain?”However, Bai Zhou soon realized that the feeling of “bullying others by relying on power” was actually quite enjoyable. Even if someone sought revenge, it would all fall on his “boss.”How comfortable is that?So, Bai Zhou decided to continue down the path of “bullying others by relying on power.”But soon, things started to spiral out of control:“Sister-in-law … does big bro know you’re doing this? I’m just a driver!”“No, big bro, you’re my big bro! Can you stand up and talk? Stop kneeling!”“Oh man, old master, you’re the local emperor of Shanghai! Why are you offering tribute to me?!”

Lao Chen was just an old, underpaid security guard in a rundown apartment complex, living a miserable life under a stingy, ungrateful boss.His wife left him, his daughter wanted nothing to do with him, and poverty was his only constant companion.In the end, death came in the form of a drunk driver, leaving him broken and forgotten on the cold pavement.But fate wasn’t done with him. In his final moments, he prayed—desperate, pleading to any deity who would listen.And someone did.The God of Wealth and Love took pity on his wasted life and granted him a second chance.Wake up again as Zhao Yiming, a 25-year-old gambler and alcoholic drowning in debt with nothing but a good face and a strong body to his name, he was given the Affinity Money Maker System—a mysterious power that let him gain wealth and influence by forming relationships, whether as lovers, friends, or even enemies.Before he knew it, he had stumbled his way into unimaginable riches.But things never go as planned. One moment of recklessness—one affair with the wrong woman—led to an unexpected murder.Now, the system has thrown him onto a new path: The Villain Route. With a negative perk that keeps the police off his trail but tightens the noose around his future, Zhao Yiming is faced with an impossible choice.Will he claw his way to the top and become the billionaire he was meant to be? Or will his second life end behind bars, just as tragic as his first?

He Xie, a private detective, specializes in investigating extramarital affairs, and once made mistresses and scumbags fearful, he is a good young man with lofty ideals. In the event of an accidental death, you have to start a new life system and complete tasks in exchange for the chance to be reborn.

In “Infernal Affairs”, he worked hard to be a “good person” instead of XXX; in “Youth Bao Qingtian”, he tattooed a sun on his forehead; in “Charlotte Trouble”, Yuan Hua and Qiu Ya sang a plum blossom together, “Lu Xiaofeng” “, “Dragon Babu”, “Kung Fu”, “Bourne Bourne”, “Lord of the Rings”, “Pirates of the Caribbean”…

- Description from novelbuddy