I Become Karna With a Million Times Crit System In Mahabharata. - Chapter 11 . Chhaya’s Oath And Emotions

A polite and lethargic boy was reincarnated in another world as a vampire bishoujo.

After breaking up 99 times, Lin Feng traveled through and came to the love apartment.

Not only did he become the landlord of the love apartment, he also brought a Love Saint system with him.

Not only did he have to write novels, make movies, open albums, and appear on shows, but also in Las Vegas.

Want me to be the king of gambling? The magic castle wants me, a magician, to be the castle owner? I’m sorry, I’m not free, the ‘Crossing the Love Pass’ task released by the Love Saint system has not yet been completed! Love Saint is me, I am Lin Feng!

- 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.

You take up a student career.

Student career upgrade to lv.7

Acquired skills: primary school knowledge, junior high school knowledge, high school knowledge.

You take the college entrance examination,

You got a perfect score.

Your basic occupation has been upgraded to lv.9, and the job transfer system has been activated.

You change jobs to become a scientist, you gain R&D skills

You use research and development skills to get space fortress construction technology

You use R&D skills to gain starship technology.

You are invincible.

- Description from novelbuddy