MTL - Super Dimensional Martial Immortal - Chapter 387 this is called professional

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.

A mission for justice that spans across two lifetimes, a fresh beginning that presents a new opportunity to succeed where he once failed. In a time of grave peril for a world on the brink of anarchy, a hero rises like a phoenix from its own ashes to offer a faint glimmer of hope.Armed with his wealth of knowledge and experience from his past life, as well as an almighty cultivation art obtained under mysterious circumstances, Fang Che sets out to exact vengeance on the Church of the Self-Righteous, a blight on the entire continent and the ones that had put an end to his past life.Original blurb:The long night shrouds the world, and the dawn is delayed.Evil descends upon the earth, and living beings suffer.He wanders in the long night, strolling upon the edge of a blade, swaying between the clouds and hell.Igniting the fire of the star soul.Since the long night stretches on, I shall be the ruler of the night.

Adrian Hudel has always been the invisible son in the Hu family, overshadowed by his elder brother Wryn, who was groomed to inherit the family business. Adrian’s only solace lies in his passion for painting, a dream he clings to amidst the cold indifference of his father, Wuner Hudel. But when Wryn abandons the family overnight, fleeing from an arranged marriage to the richest man in the country, Ethan Levistis, Adrian’s life takes a devastating turn.---The cover is mine.The cover is of MC-Adrian Hudel.Free to collect.BL Story.

After crossing over into a world of magic, Dean Bruce was mistaken for a powerful sorcerer. Though he initially intended to sternly refuse the beautiful woman’s request to become her mentor, she offered him far too much to say no!Completely clueless about magic, Dean Bruce had no choice but to make up spells on the spot. However, when he saw the astonishing power unleashed by the beautiful woman after chanting his random incantations, he was stunned.The spells he had carelessly invented… could they really comprehend magic and even forbidden spells?As Dean Bruce ascended to the pinnacle of magical prowess and became the Archmage, he candidly answered a reporter's question during an interview with the Alliance: “ never understood magic. I just made up a few incantations, that's all.”People were in awe of him—this, they believed, was the true humility of a Grand Archmage!