Forgotten Legend of the Bloodied Flower - Chapter 2473 - 2475: Return for Revenge

Some say reincarnation is a blessing, but for me, it's a dreadful curse. Cursed with endless reincarnation, I've been reborn as a villain 137 times. And all 137 times, I've been toyed with and killed by heroes who are far more cruel than the said villains... If I can't win no matter what I do, then I'll crush those so-called heroes at their very roots. - Quality Fan Translations, Made by Fans for the Fans - Villain Takes Over The Academy

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.

[Live Fully, Leave No Regrets!]

[Warning: Contain Gore!][No Harem!][Have Romance!]

[MC is neither a Hero nor a Villain.]

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Growing up amid hardship and loss, Liam's life was a continuous struggle. Determination became his driving force after his father mysteriously disappeared and his mother's untimely death.

However, even he did not foresee what fate had in store for him. One day, a mysterious package arrived. Inside was a magical quartz pendant that turned his life upside down.

From an ordinary human, he became an Ascendant, wielding power over the elements. Fire, water, earth, wood—it was just the beginning.

As he embarked on a journey through veils of mystery and realms beyond his wildest dreams, a revelation unfurled before his eyes.

Aliens are real, and the circumstances surrounding his mother's death are entangled in a complex web of secrets and deception.

……………………………………………………………

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Feng Lingxi was the traditional family’s head mistress – a person with a charismatic yet sly personality with the ability to attract people easily to her side, and having the potential to take someone’s soul away. Crossing across boundaries from a decade ago to now, a world that gives woman full respect and acknowledgement….

Don’t be fooled by her, because she was someone who would act obediently in front of a crowd but, stabs them in the back when necessary! Disguising as someone that would gain her trust and belief! That was why the Emperor of Xian started doting on her, allowing her to become absurdly daring to do whatever she liked. This made the Empress speechless to tears.
That would be the cause of the kingdom’s downfall in the near future…

- Description from Novelupdates