Nine Star Hegemon Body Arts - Chapter 2066

Yeon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded “By the time you hear this, I guess I will be already dead….”

Obelisk, the Tower of the Sun God, a world where several universes and dimensions intersect. In this world, his brother had fallen victim to betrayal while climbing up the tower. After learning the truth, Yeon-woo decided to climb the tower along with his brother’s diary.

“From now on, I am Jeong-woo Cha.”

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.

Born of a great family, world shaking genius.

The man who had shaken the world.

The story of the Swordmeister.

The first time she traveled abroad, she encountered the tragedy of a missing plane. When she woke up, she transformed from a sunny girl into a Young Madam!On the very first day after waking up, he tormented her for an entire night, and then he planned to steal her heart! How could there possibly be such good fortune in the world?She swore to escape from his grasp.“Young Master, the Young Madam has run away again...”“Damn it, launch a city-wide search within 24 hours!”He cornered her against the wall: “What exactly do you want?”“You're so disobedient. It seems I'll have to find a way to tie you to me forever...” He said mischievously, gently stroking her flat stomach.[The main text has been completed.]