Dragon Monarch System - Chapter 610 :- 9 days Later......

Sky is not born of Shen Huan, millennium is like night.

This is a rebirth who wants to release himself, and has an interesting life story after getting a less serious system.

- Description from Uukanshu

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 'Only Wisdom Awakened,' the world bears the arrival of monstrous threats and the emergence of awakened individuals wielding extraordinary powers.Hans Richter, a young man burdened by the weight of debt he had to take to cover up his family's medical expenses, inherits the 'UNKNOWN' class {Knowledge Seeker} on the somber night of his eighteenth birthday.Unlike his peers, Hans's abilities stem from his relentless pursuit of knowledge, and his boundless imagination, unaffected by the limits set by the 'system' for others.As Hans navigates this perilous world, he grapples with moral dilemmas and confronts formidable adversaries, driven by his longing to once again see his loved ones and unveil the truth behind the catastrophic events that reshaped his world.

I’m not a gamer. In fact, I barely touched games—never had the time or interest.I’m a 23-year-old college dropout, part-time construction worker, and full-time avoider of adult responsibilities.That is, until my little sister nagged me into trying a romance simulation game called Echoes of the Crimson Throne.I played it. Liked it more than I expected. I even completed it.And the next thing I knew… I woke up inside the game.Not as the hero.Not even as a love interest.I was now the personal attendant of Alice Draken—the villainess, the Prince’s fiancée, and the iron-fisted Ruler of the North.A woman whose downfall was guaranteed... unless I do something about it.