Dysfunctional - An Assassin's Guide to Reincarnating in Another World - Chapter 459 458 - Exhibition Matches(Part 1)

Elena, who spent her entire life as a cold-blooded female knight to avenge her family, ended up dying without claiming her revenge. When she opened her eyes she found that she went back into the past. By day she was a lady in a dress, and at night she carried a sword to change history and prevent her family’s destruction.

A little ruffian who fought recklessly without any morals and bottomline accidentally time-traveled to parallel space and became a Key Case Investigation Team agent. The huge change in identity had him creating chaos in the police station. However, a strange miracle system helped him repeatedly solve mysterious cases, turning him into an impudent ruffian detective!

In order to seize the opportunity, the four-year-old Ayu was thrown into the deep mountain after the blizzard.

Fortunately, kindhearted people took it in.

The Wang family is so poor, sick, disabled, and indebted, but from top to bottom, they dote on her like a jewel.

Everyone said that the Wang family picked up a money-losing item, and sooner or later they would finish the game together!

Unexpectedly, this group pet doll is really a small blessing.

Xiao Ayu took out his small pocket and smiled sweetly: Portable Space, Super Spiritual Spring, Spirit-Testing Treasure Mouse, Ayu has everything you want!

There is revenge for revenge, there is revenge for kindness.

This blessing is incredible. He is not only a small farmer, but also a small business expert. He can also open an academy, open a sea trade, and establish a noble kindergarten. He has earned the favor of all the staff!

Watch the group Chong Fubao turn around and take the family to the pinnacle of life!

The time-travel girl and the villains were dumbfounded: it turned out that they were the ones who missed the golden finger!

- 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.