Monarch of Gluttony: System of Sin - Chapter 244: 244: Above the Threshold

This is the story of a crazy lich who possesses an internal game system and brings catastrophe to the entire world.

They say the greatest blessing is marrying the idol you always dreamed of.

But Qiao Lian knows that reality is different…

The Internet claims that Best Actor Shen Liangchuan is a male god who is unaffected by any sexual drive, but Qiao Lian vehemently disagrees. It’s a lie!

After finally carrying out the contract, Qiao Lian burst out, “I want a divorce! I don’t want such a life!”

- Description from Novelupdates

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.

“The simplification of the extreme mountain breathing method… the simplification is successful… the extreme mountain breathing method → ​​breathing!”

Chen Fei took a deep breath.

“Extreme mountain breathing method +1 experience.”

“…”

- Description from novelbuddy