I Don't Want To Be An Ojakgyo - Chapter 172

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.

Carn wakes up from a vivid dream where he spent a thousand years as a gargoyle, guarding a demon lord's tomb.In this dream, he possessed supernatural powers, including the ability to teleport and instantly kill anyone within range who broke eye contact with him. Heroes, saintesses, adventurers, all fell before him.When he returns to his normal life, things take a strange turn. Carn realizes he still has the gargoyle’s powers, and the world he has woken up to seems different.But adjusting to the new reality is not the real issue. Carn brings back something nobody in this world has imagined. Not only he imports his powers to this alternate Earth, but he also carries over his gargoyle instinct and his hobby. He loves snapping human necks.Whether it's ordinary humans, explorers, super soldiers, cyborgs, mutated beasts, monsters, or mysterious entities from other dimensions, Carn eagerly anticipates snapping their necks, one neck at a time...In secret, of course.

On the wedding night, when the bride hung herself, the handsome husband was sickly, the concubine was glaring like a tiger to see what her best next move would be. Shu Huan who time-travelled to the ancient times encountered such a mess.

“Men and women can’t touch each other. You doing this is not right, right?”

“Humph, you are already married to me. You still care about that?”

“Eh eh, second young master, you haven’t healed yet. I’m thinking for your own good.”

“Doesn’t matter, this young master isn’t interested in your bean sprouts like body.”

While sleeping, they put a barrier of pillows between them

Woman: “Eh…Eh….”

Man: “Eh…what are you doing?

Woman: “Don’t cross the line.”

Man: “Ah……?”

Woman: “If you cross the line, I’ll hit you with the incense burner.”

Man “Uh……”

Woman: If……if I accidentally cross the line……you don’t…”

“Humph……if you continue to talk, I’ll tear your clothes and seal your mouth.”

“You check so carefully because you are afraid that I’ll harm you?”

“That isn’t it. Humph, I only want to know why someone will commit suicide by hanging on the wedding night.”

“……”

“You hate me so much? You prefer to die instead of spending the wedding night with me?

- Description from Novelupdates