I’ve Led the Villain Astray, How Do I Fix It? - Chapter 365

What if you woke up one morning and remembered all 999 of your past lives?

Chae Woojin, an actor who will shine brighter than the stars. A story about his journey towards his dreams!

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.

In the rural northeastern mountainous regions stands a tiny Buddhist temple, named One Finger Temple. It isn’t a large one but it is extremely miraculous.

The temple has rice that emanates an aromatic fragrance.

The temple has sweet and refreshing water that rivals ambrosia.

The temple has Buddhas that grant wishes to the sincere.

The temple isn’t large but it has everything. The temple isn’t large but it has flourishing incense offerings that far exceed all temples. The temple isn’t large but it attracts both citizens and foreigners that line up overnight…

The temple has a bald but handsome monk. Every day, he would bawl, “I want to renounce asceticism! I want to marry a chick that’s not too pretty, have a cute baby, and lead a stable life!”

How can there be any invincibility?

How can there be any Xeon undefeated?

No one in this world can be eternally number one, anyone can be defeated.

including me.

I’ve been waiting for that one person to show up, beat me, tell me that my way is wrong.

It’s a pity that that person hasn’t come yet.

…

False martial arts: strengthen yourself, break the limits of the human body, and resist bullets with flesh and blood.

Real martial arts: use the magnetic field of life to dominate the magnetic field of the stars, use the small universe of the human body to attract the power of the big universe, travel the starry sky, and smash the planet.

- Description from novelbuddy