Bad End Night - Volume 1, Chapter 1: The Lost Libretto

“Dear, it's time for your medicine!”The beautiful and pure Holy Daughter brought over the medicine for treating his wounds.On this day, he saw betrayal with his own eyes and experienced despair with his soul...From this day forth, the Hero was dead, send paper offerings if you must!

Travel across different worlds and become a fallen aristocratic lord. With the help of the proficiency panel, you can start your liver experience with the ancestral knight breathing method, follow the wizard’s footsteps step by step, and embark on a bizarre and mysterious journey.

- 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.

As someone who had always aspired to live a laid-back life, Xu Lin received the news of his hometown’s old house’s demolition at the age of 24. As a result he would be compensated with about 5 million. But before he could grasp the feeling of being a second-generation displaced person , he blinked and found himself back in the green years of being 17.Now, he had to embrace the “salted fish” state once again and wait for another 7 years. Despite his initial thoughts, a peculiar thing happened due to a confession incident, disrupting his plans.[Congratulations Host on activating the Twelve Zodiac Love System!]Thus his fate became entangled with 12 different types of girls…