Endless Transmigration: These Shitty Lives are Killing Me - Chapter 8: Baek Ain vs 3rd Rank Magical Beast

I met the male lead in prison.

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.

Have you ever heard the story of the monster?

Have you ever thought that monsters have always existed, and they are lurking around you?

Have you ever thought that the reason why you are still safe is because the profession of “Monster Slayer” has existed for thousands of years?

Wang Qianchen turned into a monster when he woke up, and was ruthlessly hunted down by the monster slayers, and since then he has also entered a strange world!

- Description from novelbuddy

“Gu Hangshen! Your sister stole my man, and you helped her do it! Your whole family is rotten!”“Whatever my sister owes you, I'll compensate you.”“And what will you compensate me with?”“Me.”“...”Later, he not only gave himself up as compensation, but he also came with a clingy little bundle of joy...