I Live on the Land in Global Games - Chapter 446 - 429 Qingshan—Canter

I gave them my everything.My time… my strength… my heart.I trained while they slept.I smiled when they laughed.I stayed… even when it hurt.And what did I get?Nothing.They looked at me like I was pathetic.Like, I didn’t belong.Like I was… less.But I... the naive person I am, continued trusting them.They told me to act like trash, fine—I became trash.They told me to act like a scumbag, fine—I played the role.However...One mistake, one single moment...That’s all it took.And they threw me away.But now…Someone else woke up in my body.A stranger, a man who doesn’t know the pain I suffered, but wears my face.Let’s see what he does with it.Because me?I’m done with this life, so to the soul who took over my body...This is your mess now…'Gray'.

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.

The chairman of the White House of ‘City A’ and his wife died in a plane crash, leaving their 3-year-old orphan with a large fortune. The relatives were trying their best to cheat the girl and enter the house to get ahold of it. But who knew that the ’10 billion-dollar doll’ would have chosen her father, or also known as the city’s most popular guy, on her own…

Luo Sheng: “f*ck, I’m not doing it!”

Yinyin: “Daddy, hug!”

Luo Sheng: “….”

A few days later —

“F*ck, who dares to bully my daughter? I won’t let him get away with this!”

- Description from Novelupdates

I met the male lead in prison.