Reincarnated as an Evil Harem God - Chapter 27: Love Meter: 69% Synced***

The blacksmith Anvil created weapons alone in a ruined world.

He came across a community, a hero universe, where there are heroes of every dimension.

All the heroes wanted his weapons,

All the monsters hated him,

All the world blessed his existence

however nobody prevented his death.

Decades later, a dimensional invasion started on earth.

Kang Shin-hyuk, a boy who can’t use mana inherited Anvil’s VIP ID and memories.

The brash Li Chengfeng makes a living through trickery with his clueless but loyal servant, Xiaobao. One day, the love of his life is murdered, making him a suspect, and he meets a demon who suspects he is the reincarnation of a traitorous immortal.

He is a legend among film directors, he completely changed the whole world’s view on Chinese directors! —Washington post.

He once again created a legendary movie, and the flock of fans almost collapsed the movie theater! ―Chicago Sun-Times.

To cry with his movies, to be moved by his movies, to shout crazily because of his movies, what else is impossible? A legendary figure in the director world, who made everyone who laughed at him feel ashamed! -New York Times.

He is the hottest director in Hollywood, the lover in the eyes of all beautiful actors and movie fans, unparalleled, a legendary director who rises like a comet, director of this brilliant life, a legend that subverts all old concepts, welcome, super director ——Smith Zhang!

- 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.