From the Heavens Descended an Immortal Sister - Chapter 310 - 305: Distress Call?_1

Junpei Takeda, a high school student, is childhood friends with Noriko Tatsumiya and is bullied by Kido Shouta. One day, while bullying Junpei, they (Junpei, Tatsumiya, & Shouta) were suddenly summoned to a different world by the whim of “God”. Summoned Heroes with cheats, or so he thought. But it turns out Junpei’s stats were even worse than an average farmer. Tricked into a deathly labyrinth by the only one he trust, he walks the journey for revenge.

A scheme led to a cute baby for them.

Several years later, she met her former lover once again.

The iceberg-like president turned into a big wolf full of desire!

He stayed together with her all the time, disproving rumors with acts.

She only wanted to say that rumors truly hurt.

- Description from Novelupdates

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.

“M... Marissa! Are they my kids?” Rafael's eyes weren't moving away from the adorable kids' faces.“No, Rafael. They are not,” Marissa said with a fake smile, “They aren't yours. Remember?” she batted her lashes quite dramatically, “We were never married!”Marissa Aaron’s elder sister Valerie Aaron jilted her blind boyfriend on her wedding day and ran off. For face-saving, Merissa's family pleaded to her to marry Raphael Sinclair.The irony? She was not allowed to tell her blind husband that she was not Valerie but Merissa Aaron.On the day of Raphael's successful eye surgery, Marissa got to know that Valerie was back to take her rightful place as Sinclaire’s daughter-in-law.Marissa tried explaining to her husband that she was the one married to him, but he did not believe her. Instead of any more convincing, heartbroken Merissa decided to leave the city without telling him, her secret.Raphael Sinclair was the classic definition of drop-dead gorgeous and was the only heir of the Sinclair group of industries.What would he do when he came to know that all this time the woman who offered him, her love and her body was not Valerie but her younger sister Marissa Aaron?How would he react when he came to know that he was the father of the babies Marissa was carrying in her womb?Would he go after Marissa and win her back?And the million-dollar question!Would Marissa ever be able to forgive him and love him again?