I'm Not Your Husband, You Evil Dragon! - Chapter 41: Even the Saintess Approves

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.

【Welcome to the Love Simulator】【You can freely choose to simulate with women whose appearance rating is 7 or above (on a 10-point scale) and have basic connections to your reality.】【The simulation is entirely free; please explore on your own.】【After the simulation ends, the system will evaluate the results and provide rewards.】【Current number of simulations: 4】【The number of simulations is not fixed and can be restored through special rewards or the passage of time.】Wait—why are all the simulation targets such difficult-to-handle 2D female leads?

In her past life, Chen Wei’er was too blind to recognize people for who they were. She caused the destruction of her own family for the sake of a scum, and hurt the people who truly loved her. Fate gave her another chance to start over. In this life, she became decisive and worked hard in her career. She became a proud dance queen who managed to destroy the third-wheel who schemed against her, take revenge on the scum, and avenge all past grievances. She became a sweet wife who was coquettish and flattering, boldly seducing her aloof husband, He Xun.

His difficult wife suddenly became sweet and gentle. He Xun finally couldn’t resist holding her tight and whispered into her ear, “What do you want? I’ll give you everything. My life is yours too, so stop teasing me…”

One night, Chen Wei’er had a dream. She dreams of her past life, and the world after her death. He Xun was sitting in the hospital’s corridor, hugging her bloodied corpse as he went insane. “Had I known that in exchange of letting you go, you would die instead of being happy, I would never have let you go…” Then, He Xun killed all of her enemies and built a small wooden house in front of her grave. He never took another wife but became her grave-keeper. To think he loved her so much. Then, she learned that fate only gave her another chance to start over because this man, who had loved her for two lifetimes, had begged in front of her grave day and night for another chance in exchange for a lifetime of loneliness…

“I can’t accept this! I can’t! Even as a ghost, I’m going to spend eternity cursing that your relationship will shatter like glass! Break apart like a pair of mandarin ducks that fly away from each other!” With such a persisting obsession, it would be difficult for the vengeful departed spirit to move on.

Ji Man had only read a light novel to pass the time, but she was unexpectedly pulled into a very strange dream. She had become the novel’s most vicious villainess.

The novel rewinds to the beginning. The villainess that had been ordered to commit suicide reappears onto the stage and begins to follow the plot as she walks toward the novel’s ending once again, to a courtyard deep inside a marquis’s residence. A female lead that’s like the Holy Mother. Countless cannon fodders. The imperial family’s favor…

- Description from novelupdates