I Only Want To Kill - Chapter 9: Kill them all

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.

To save a doomed fantasy world, I killed the main characters, then destroyed the game world, and fell into another timeline as the academy's top seat and rival to the protagonist.Now, I'm trying to save the world and steer it towards a better ending…But I'm the final boss.

Six years ago, he disappeared silently! After six years, he becomes the unparalleled "God of War" and returns with glory, only to find that he has a daughter whom he never knew of. Looking at his wife and his daughter, he says, "In this lifetime, I'll bring you the greatest honor and glory!”

Iris Morris is by no means looking for any more drama in her life ( she has loads of it thanks to her mom). However, when Lucas Andrews pops up and ruins her interview, the drama she has been running away from unfolds in all the “wrong” ways, like him suddenly filling her small circle of influence. . .and her mind!For Lucas Andrews, nothing is as important to him as getting the Adder magazine to be number one on the bestsellers list worldwide. So when Iris comes to support the promise he made to his mother out of her sheer love for editing, he can't help but fall for hard for her, especially when a fake dating deal to ward off his possessive “fan girl” comes into play.