The Science Ace Go Back To The Past To Save Her Brothers - Chapter 17

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.

“Who knew the key to surviving a deadly island was... well, charm? Guess I’ve got a superpower after all.” – Lucas Carter.When a school field trip takes a disastrous turn, Lucas Carter and his classmates find themselves stranded on a remote, uncharted island. With no rescue in sight and the wilds teeming with danger, survival becomes a brutal challenge. But when Lucas awakens the Harem Survival System, everything changes.The system is as bizarre as it is powerful: for every woman Lucas seduces, he gains extraordinary survival skills and critical resources.From hunting and crafting to strategic foresight, each intimate connection gives him the tools to outwit the island’s many threats.As Lucas grows stronger and more capable, the dynamics among his classmates shift.Friendships turn into alliances, jealousy brews in the shadows, and the boundaries between survival and desire blur.Meanwhile, the island itself hides secrets far more dangerous than its untamed wilderness.

In the twenty-ninth year of the First Emperor, Bo Langsha was attacked.

When Ying Zheng merged the memories of the 21st century history doctor, looked at the mighty mountains and rivers in front of him, and said to himself, “In this life, my Daqin can’t die!”

- Description from novelbuddy

After his tragic life ended, Aleron expected to reincarnate or transmigrate, but instead, he was transported with his body and summoned as a hero...only to enter a new hell as he had trash stats and couldn't activate his Divine Blessing, prompting the King to extract his boon.He was tortured and onward to being buried alive with his soul ravaged after they removed his Divine Blessing. But all was not lost as Aleron found he had the Ultimate Gacha System at the death's door and initiated his first summon in the Lords of Arcane banner.[Congratulations! You have summoned Darzax the Graveborn, the Sorcerer of Death and Necromancy.]