The Surgeon’s Studio - Chapter 2912 I finally found it!

For three years, Finn Taylor is utterly humiliated. He has endured everything from physical beatings to verbal abuse. For three long years, he has gone by only one identity—the useless matrilocal son-in-law of the Larson family. But this life as he knows it is about to be turned upside-down as he reclaims his position as the head of Peregrine Hall.

[ R18+ ]“TAKE YOUR SHIRT OFF…NOW!!” Zara commanded the king Erythian in anger as her eyes turn blood red.he didn't see it coming and his face is flushed with shock..“WHAT? LYS—” he asked before she interrupts.“if I have to ask again...I WILL DO IT MYSELF” she is unrelenting.Does Eythian comply?Zara, a modern girl from Colombia law school is transmigrated into the body of an ancient queen.She wakes up as Queen Lysandra.With a turn of events, she is Obsessed over by the ruthless, Warlord Alaric and finds herself Falling so dearly for him even if she is aware that it’s forbidden.Simultaneously, she is also betrothed to and in love with his enigmatic half brother King Erythian.let it be known that both brothers detest each other.she fights to hold on to her heart, but fate is cruel.Everything shatters and the man who destroyed her…now owns her.The lines between love and duty are blurred as Zara must navigate threats against the kingdom, alongside the love triangle with her between two brothers who despise each other.As she is taken further into a world of secrets.Will Zara honor Queen Lysandra`s duty to the crown and her people, or will she risk it all to follow the desires of her heart?

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.

To exist in a certain place, at a certain time—it's always either by chance, or by choice.But sometimes,There is a third force.One that doesn't ask.One that doesn't explain.It simply places you—wherever it wants.Arséne had always been dragged into places he never chose.Situations he never asked for.Realities he never belonged to.And when, at last, he decided to act on his own terms—To take the initiative,To move first,To choose…He simply died.