Ultimate Antihero - Volume 4, Afterword

Jun Xie was the number one assassin in modern earth. His skills and knowledge in the field of assassination were unparalleled, his accomplishments unprecedented, his reputation terrified the entire underworld. However, during a mission to retrieve a mystical treasure, a mishap occurred…

He is now Jun Moxie, a sixteen year old super level debauchee, sole heir to the declining Jun family. A family of valiant heroes, left with an old grandpa, a crippled uncle and a debauchee as the sole heir! Accepting the world’s criticism and cold stares with a smile, his new journey begins! His life will be carved by his own will! Rise to the top! Evil Monarch Jun Xie!

“This cup I toast to those I’ve killed in my past life. Forgive me, for there is no chance for you to have revenge. Gulp!

This cup I toast to those whose life I will take in my new life. Forgive me, for you are fated to die by my hands. Cheers!”

- Description from novelupdates

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 a vast fantasy world where countless dangers lurk for humans and demi-humans alike, no creature is more fearsome or powerful than the Dragons, proud, intelligent beasts who stand at the very peak of existence.Dragons do not fight for kings or armies. They are the purest manifestation of nature’s fury and brutality, beings born to stand alone. Yet even such creatures seek a connection, a single partner chosen only once in their lifetime, bound through a unique Pact that links body and soul as one.Those chosen are no ordinary individuals. Dragon Riders soar through the skies atop their mighty companions, dominating land and air alike with powers of overwhelming magnitude. Thus begins a ruthless race between peoples and nations, each striving to secure the loyalty of the most powerful Dragon Riders the world can produce.This is the story of Theo, a noble whose family was brutally murdered, leaving him orphaned and alone as a child. Now a young man, his gaze turns toward the Royal Academy of Dragon Riders of the Empire of the Four Kingdoms, for nothing could serve vengeance better than a creature that embodies the raw fury of nature itself.But while Theo’s steps are driven by revenge, his journey will be filled with both intriguing allies and cruel enemies. And in his search for a battle companion, he will discover something far more precious, because the same mythical beast capable of terrorizing the skies and the land also holds another side, one far more unexpected than anyone could imagine.