Who Designed This Underworld Dungeon? - Chapter 474 - 328: What If Monsters Only Repeat

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.

A High School Boy without friends, Odamori Tooru reincarnated into a Fantasy World after a bus accident on a School Field Trip. The job that was drawn 『Slavemancer』a Cheat occupation that dominates the minds of other.

Food blogger, Qin Zhenzhen, transmigrated into a novel and became a young chubby girl who forcibly married a handsome guy. The handsome guy was truly attractive, but he was the villain in the novel. He was sinister and vicious, and everyone in his family was cannon fodder.She couldn't afford to mess with him. With that in mind, she hurriedly approached him and asked for a divorce.The handsome man narrowed his eyes. “Do you want a peaceful divorce? Fat chance!”Since a peaceful divorce was impossible, she'd have to change the storyline.At first, she thought this was going to be a difficult journey with many obstacles. However, it turned out to be a smooth ride, and she unexpectedly became pampered by everyone around her.People were born kind. The supposed villain, who didn't experience all those terrible things in the novel, could actually have a positive outlook in life.“I'm capable of getting rid of all feelings of jealousy and dissatisfaction. I can also lead a family to the path of wealth. Meanwhile, I also managed to conquer a man who only wanted to take revenge on me from the very beginning,” the female lead said.“I'm all about scheming and strategies. Anyone who messes with me will die, and anyone who bullies me will also die. As for the woman who both messed with me and bullied me, I'll punish her by making her stay with me for the rest of our lives,” the male lead said.

“I believe that if you have a problem, we just need to solve it with firepower. If the problem isn't solved by then, it just means we weren't using enough firepower.”In a world of swords and magic, Lucen Thornehart, the eldest son of the Iron Duke, was considered the shame of the noble knight bloodline. No talent, weak, and worthless.Until one day, when a fever awoke his previous life's memories and the knowledge of the class from an old game he used to play, Gun Mage.More than just guns, he creates weapons that have never been created in this life and the last.A sword that heats up, turns crimson, and could melt metal.A rune-engraved gun that mages use to amplify their spells.A giant sword that you would only once see in a video game, which makes an explosion every time it hits an enemy.A gun that is powered by mana and shoots out condensed amounts of mana.Airships, steam trains, and boats.Lucen Thornehart isn’t here to play fair. He’s here to redefine warfare, with overwhelming firepower.