My Dungeon Life: Rise of the Slave Harem - Chapter 1522

The frail and sickly Wen Jiexi had always wanted one thing: a healthy body and like a dream come true, one day, she was selected by the system!

System: The amazing me shall grant you a strong physique and divine strength! However, you have to maintain your health through monthly missions! If you fail to complete them~well, then you’ll stay as a female King Kong, forever~

Wen Jiexi: What?! Will I no longer be able to live my life freely again?!!

Mother with an alarmed expression: My frail daughter is actually trying to do the most sit-ups possible?!

Father made a strange face: My delicate daughter ran on the treadmill for an hour?!

Brother’s expression crumbled: Can anyone tell him how his cute little sister who is as precious as a delicate white flower…was actually able to use one punch to break a sandbag and smash a hole through the wall!!!

Through a series of unexpected circumstances, she was pulled into the entertainment industry and became a female martial artist!

Female Fan: Our darling Wen is the most awesome! She’s even more handsome than a man!

Male Fan: The girls today are so domineering! To be able to throw away all of one’s shame, I want that feeling too!

The frozen expression after being hugged by the princess from behind: …..

Wen Jiexi held up a hand: No, no, no! It’s not like that!

- 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.

After she had transmigrated into the body of an abandoned wife of a little marquis in Ancient China, Su Nuan Nuan, a modern-day food lover was delighted!

In the end, war couldn’t be extinguished. But, there was a transformation. Even in the heart of a worthless accomplice in murder who was indifferently continuing his task, there was a transformation. The massive weapon “Object”.

This was a weapon that changed the whole definition of war. An exchange student named Quenser, who was dispatched to the battlefield, met at the base a girl with a strange aura. The girl, dubbed “Elite”, is the pilot of “Object”. The near future. This diminutive boy had come to take on the role of standing up against the strongest weapon “Object” for the sake of the girl. This was the motive for their first meeting.