Primordial Heir: Nine Stars - Chapter 18: Second Gear

Qin Chen was transmigrated to the Taiyi Holy Land where he became a servant in charge of sweeping the floor. However, on his 16th birthday, he was rewarded with a system where he was rewarded whenever he signed in at a new place.

When he signed in at the Empire Ruin, he was rewarded with the strongest Chaotic Holy Body and the Chaos Emperor Scripture.

When he signed in at the Demon Sealing Land, he was rewarded with the Probationary Royal Armies.

When he signed in at the Alchemy Palace, he was rewarded with the Divine-grade Alchemy.

When he signed in at the Herb Garden, he was rewarded with an Immortality Elixir.

When he signed in at the Empire Palace, he was rewarded with the Emperor-grade Divine Art, Revival.

…

Qin Chen thought he could just spend the rest of his life signing in at different places until he became invincible.

However, when the ruin of the Great Kingdom appeared inside the holy land, people from other holy lands, prestigious families, and even ancient empires gathered to defeat the All-Powerful Demon King who appeared with the ruin. The Demon King had killed countless people and had planned to destroy the Taiyi Holy Land.

Qin Chen was left with no choice but to step up. When he killed the Demon King with a single slap, he sighed, “Why do you guys have to force a mere servant to act?”

How can there be any invincibility?

How can there be any Xeon undefeated?

No one in this world can be eternally number one, anyone can be defeated.

including me.

I’ve been waiting for that one person to show up, beat me, tell me that my way is wrong.

It’s a pity that that person hasn’t come yet.

…

False martial arts: strengthen yourself, break the limits of the human body, and resist bullets with flesh and blood.

Real martial arts: use the magnetic field of life to dominate the magnetic field of the stars, use the small universe of the human body to attract the power of the big universe, travel the starry sky, and smash the planet.

- Description from novelbuddy

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.

Yeri was once a succubus, a powerful and irresistible seductress who fed on desire. Now reborn as a stunning young woman in the modern world, she must navigate the confusing collision of her human innocence and her demonic memories.One night, fate leads her into the path of Shin Keir, a dangerously magnetic and notorious CEO known for getting everything he wants—except peace. Their accidental encounter sparks an intense, uncontrollable passion, and a single night together changes everything.***Excerpt:The dream had returned.Same eerie forest. Same surreal woman in the crimson dress. But this time, the setting had changed slightly. She now stood at the edge of a cliff made of jagged, glowing red rocks that resembled oversized rubies.Scarlet butterflies floated around her like living embers.A thick fog blanketed the area like some forbidden realm between worlds.She turned to him, her smile soft, sweet—and somehow tragic.She was heartbreakingly beautiful, ethereal yet forlorn, like a love story written in fading ink.Shin had tried to call out, but the wind swallowed his voice. As he stepped forward, the woman mouthed something. He couldn't hear her.Then, in a horrifying instant, her body tilted, and she plummeted off the cliff.The despair that followed wasn't just a feeling—it was a full-body, soul-tearing scream that never made it past his throat.Without hesitation, Shin leapt after her.He awoke convulsing, drenched in cold sweat. His eyes gleamed with a strange madness, a devil struggling behind the polished CEO exterior.***Disclaimer- Places and characters are all works of fiction.