The Great Mage Returns After 4000 Years (Web Novel KR) - Vol 2 Chapter 417

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.

In the foreign world, the martial artists dominate the world and the sword of the emperor controls the fate of hundreds of millions of lives! Long Yu, the number one killer on Earth, after dying, takes rebirth in this new world in an aristocratic family of martial artists but faces rejection because he is unable to practice martial arts.

[Ding! The host is about to die socially, the Goddess Conquering System is activated! ][Binding successful! ][Rebirth begins! ]----What Happened wasn't i caught masturbating, how could i rebirth?“System, Introduce Yourself”----[Goddess Conquering System Activated!][Main Strategy Mission Unlocked!][Target – Clara Mackerel][If Clara violently resists or if you experience social death after being intimate with her, it will be deemed a failure, and you will restart.][Upon completing the mission, system rewards will be given]----“System, do you have any other functions? Is there a beginner's gift package?” Harry asked expectantly.[This system only issues Goddess Conquering missions and rewards for completing those missions.][In the event of failure, the system will select a time period for the host to rebirth.][Other functions must be discovered by the host.]

What kind of story will happen when Yi Yu crosses the Tivat Continent with the backpack of his DNF account that he got out of the pit?

Without the Eye of God, can’t get elemental attributes?

Sorry, I have another elemental weapon, Fire Ice Dark Light, have you seen it?

Wendy: “?G Hey, there’s a whole new version of the story made for you, would you like to hear it?”

Diluc: “This is the man I want to surpass.”

Lisa: “Little cute, do you want to date your sister?”

Gan Yu: “Are you willing…will you work overtime with me?”

Ke Qing: “Would you like to witness this time of change with me?”

Ningguang: “One hundred million Mora, come to the sky and chat with me.”

Zhong Li: “Wandering around in the world, I can actually meet this wonderful person, Mr. Yi!”

Snow Queen: “Are you going to help me or stop me?”

(You can enter if you haven’t played it before, there are warm daily directions and battles, please rest assured to eat)

- Description from novelbuddy