Reincarnation: I Have Always Been Rich - Chapter 2

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.

“We are well aware that the relationship between us is not healthy. Our love is far from perfect. It’s messed up. Just like us.”

– Bing Shi & Mr. Jelly

After a painful separation, Bing Shi gets a once in a lifetime opportunity to get back together with the ‘love of her life’ under one condition. To get one of her wishes granted, she will have to travel to different worlds and finish all the assigned missions from the System HeadQuarters.

In each world, she will encounter the best species of men — men that are many times more influential than the Mr. Jelly from her previous life. Will she be able to resist the alpha men that could make any human fall to their knees?

Bing Shi is not sure if she will be able to finish all the missions, but she will surely stay loyal to her boyfriend until the very end.

No matter what it takes, she will be stronger than the bad things that have happened to her.

She will be stronger than the sadness that threatens to consume her.

She will be stronger than the darkness that tries to pull her down.

And, because of that, she will be able to keep moving forward and find a way to make life work for her......

With the Legendary Mechanic System, I transmigrated to Marvel Universe to be Dr. Zola’s assistant.

With Mechanical Force Analysis, I can learn every black technology.

Winter Soldier’s arm? I built a better one for you.

Iron Man’s armor? I already made it a decade earlier.

Doc Ock’s tentacles? I am the one who provided core technology.

Hulk’s mutation? Sorry, I was there and got hit by the radiation too.

As for a certain purple potato, can he collect all Infinity Stones?

……

However, I only had one simple ultimate dream. That is to go home…

- Description from Novelupdates