The Good-for-Nothing Seventh Miss - Chapter 2646 - : Phantom! Sudden Strike (1)

Let her shout out: “Oh handsome and sweet-talking Tokyo gentleman, I must have you. You are mine!”This is the story of how a boy from Iwate Prefecture became a Tokyo gentleman.

Xia Changge is a timid and honest cultivator who has practiced for thirty years without even killing a chicken.

His ordinary life changed after he was killed because his fellow Daoist next door went out to seek opportunities, and begged Xia Changge to help take care of his wife and daughter…

Longevity flow, independent family flow.

- Description from novelbuddy

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 world steeped in tradition and shadowed by secrets, a young girl’s life is torn apart when her family is destroyed, and her heritage stolen. Her father, in his final act, seals away a legendary power and treasure, leaving her with nothing but cryptic clues and a burning desire for vengeance.With a blade in her hand and rage in her heart, she embarks on a perilous journey, unraveling the dark conspiracies that surround her family's legacy. As she faces deadly foes and unearths long-buried truths, she must decide whether to unlock the immense power her father protected—or let it remain hidden.Her path is one of blood, betrayal, and redemption. Will she rise above the chaos, or will the weight of revenge consume her? Witness the making of a legend in this gripping tale of sacrifice and retribution.