The Substitute Bride - Chapter 21

This is a time of great powers: The vast Persia, Sparta that is founded by force, Athens with its trade and business, Thebes the rising star, The ambitious Macedonia, The twin heroes of the Western Mediterranean, The rising Rome and so on.

This is an era of brilliant stars: Agesilaus II – the last king of Sparta, Epaminondas – the Rising General of Thebes, Philip II – the founder of Macedonian hegemon, Dionysius – the tyrant of Syracuse, Camillus – the Roman dictator and savior…

This is an era of contention among a hundred schools of thought: Plato – the great philosopher, Antisthenes – founder of cynicism, Pythagoras – school of number, Democritus – the encyclopedia scholar, Hippocrates – the father of western medicine, Aristophanes – the great dramatist…

What will the hero bring to the world when he comes to this age as a humble mercenary through rebirth?

- Description from Novelupdates

My name is Zhang Yanhang, just an ordinary Awakener and a part-time college student living a monotonous life, following the routine of school, cultivation, and home. I neither smoke nor drink; my only hobby is observing humanity during moments when time stands still.I thought my dull life would continue forever, but one night, as I lay in bed ready to sleep, I unexpectedly stumbled upon something interesting.【Enter the Ashen World?】【Option One: Yes (Successfully enter the Ashen World and gain the ability to digitize your body as well as ways to become stronger, the price might be oversleeping and being late for school tomorrow.)】【Option Two: No (Refuse to enter the Ashen World but feel it's a waste to sleep immediately, so decide to stay up all night gaming and cultivating, the price might be oversleeping and being late for school tomorrow.)】【Option Three: Ignore for Now (Suggested for those with difficulty making decisions, you will agonize over whether to enter the Ashen World and will only fall asleep at two in the morning, the price might be oversleeping and being late for school tomorrow.)】ps: The protagonist is not saintly, is decisive and ruthless, and thinks differently from the average person. Please refrain from criticism if this is not to your taste.

She is an expert in medicine, the only daughter of Yun Tian, Yun Valley’s master.

Her parents died, leaving her alone in this world. She fell from heaven to hell. She had a marriage prospect but her future husband broke it off. The entire world view her as a joke.

She blossoms in Feng Yun Hall, with unparalleled wisdom and startling beauty.

Against all the people eager to make a move, she lifts her hand first. Kill the chicken to warn the monkey.

But nobody knows that the soul within her has long been replaced by someone from another world.

She has no regret in the past life and originally plans to live an idyllic life, but because of the same question from the past life, she gives up the peaceful life and steps into the power struggle for imperial power.

- 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.