Became a Medieval Fantasy Wizard - Chapter 20:

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.

Question, there is a beauty under the starry sky, her black hair looks like eternal night, her bright eyes shine like stars, her powerful magic power makes the world tremble, and her peerless beauty makes all living beings surrender, who is this beauty?

“That’s right, it’s me, the Witch King, Dorothy”

ps: The real name is “Otaku Witch”, a slow-fire setting text, too watery to enter! Don’t like water! Don’t like water!

- Description from novelbuddy

I’m not a gamer. In fact, I barely touched games—never had the time or interest.I’m a 23-year-old college dropout, part-time construction worker, and full-time avoider of adult responsibilities.That is, until my little sister nagged me into trying a romance simulation game called Echoes of the Crimson Throne.I played it. Liked it more than I expected. I even completed it.And the next thing I knew… I woke up inside the game.Not as the hero.Not even as a love interest.I was now the personal attendant of Alice Draken—the villainess, the Prince’s fiancée, and the iron-fisted Ruler of the North.A woman whose downfall was guaranteed... unless I do something about it.

Jiang Yu was a small mermaid who couldn’t sing. He had always felt inferior because of this. Not until he came to shore to find the father of his baby did he discovered that his talent turned out to be acting. Since then, he had trampled on the scum man, going on the acting road all the way, and progressing triumphantly.

Qin Shen: ??? You ran away after sleeping with me, and you still call me a scum man?

The not yet met Jiang Yu: Oh, it’s a small star who wants to hug my thighs.

The after contact Jiang Yu: Really fragrant.

Qin Shen found that things around him often disappeared, at first it was handkerchiefs, then ties, and then his shirt. And every time he lost something, there will be more pearls around him. One day, he caught all the things he had lost in that room, and he saw a little thief in his pajamas.

The little thief Jiang Yu is not happy, pointing at the jar of pearls, I am not a thief, I have money for you.

- Description from Novelupdates