Harem Link Cultivation System - Chapter 3: The Engagement Trial

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.

Three years ago, when Sovereign Union disbanded, gaming genius Mo Bei laid low and went into seclusion.

Three years later, she returns with a concealed name, disguised as a man.

Despite being scorned and loathed, she ultimately reascends to the thone, causing a sensation in the entire nation!

Handsome but aloof, pursued by countless fans, he was the famous King of the eSports scene.

Dark Flares’ Captain, who was known for his looks, was even more famous for his ambiguous playing style.

*

When she first joined the team, he told her, “Know your place. Do not try to have inordinate ambitions.”

Subsequently, when her identity was exposed, he looked up from his seat at the table and stood up gradually. “Are you thinking of deserting me after marrying me in the game? Hmm?”

Sequel to National School Prince Is A Girl! Mo Bei is the disciple of NSPG’s Almighty Qin. Join him as he too becomes one!

The world is big, but I am the only one who is orthodox.Sweeping the world's immortal sects with the power of the Celestial Dynasty.A strong man who practiced the 'Way of the Emperor' came to a world full of immortal sects, and a secular dynasty that was despised by the practitioners gradually came to be on an equal footing with all the top immortal sects.The law of the dynasty is that everything in the world is the king's land, and the shores of the land are the king's ministers! There is only one orthodoxy in the world, and all immortal sects are illegal organizations!

Once upon a time, an Alchemist Grandmaster from the World of Immortals accidentally took possession of a playboy, who hailed from a rich and powerful family, and became a student in the middle of his midterms.

By the means of a miraculous immortal technique, he blended in and mingled amongst the femme fatales’ group to dominate the city! The nature of this novel’s origin is shamelessness to the core; having no sense of shame is just a basic foundation, but if the most shameless isn’t set yet, then become it!

- Description from Novelupdates