Medical Princess - Chapter 260 - Sinister, Kill Three Birds with One Stone

​The world, Earth, was devastated by the Great Incursion, an apocalyptic invasion by dimension-hopping monsters. Humanity's only hope now lies in Galaxy Fall, a newly accessible parallel world where they can gain strength through a System of quests and missions.​Five hours after the Invasion, the betrayed survivor Mirabella is mysteriously reborn and gains a unique power: the [Master Account System].Her initial skill is the deceptively simple but devastating 'Multiplier x100', which applies a 100 times buff to all her offensive capabilities, including physical attacks, spirit energy skills, and damage-over-time effects.​Mirabella must now transform from a silent survivor into the world's most feared warrior, who was only scared of one thing, which is?“I Hope I don't run out of opponents in Both worlds.”

On the day he experienced the most shocking betrayal of his life, as if that wasn't enough, he was beaten half-dead—and that was when the Infinite Wealth System awakened within him.[System Activation Complete!][Congratulations, Jayden Cole. You have been chosen as the Host of the Infinite Wealth System.][Now let’s fix your miserable life!]Thus, the Infinite Wealth System changed his life.The system tasked him with completing many challenging missions—some that could even threaten his life or land him in grave trouble—but the rewards were mighty![Task #002: Buy the most expensive item in a luxury store. Pay in cash. Say, ‘Keep the change.’][Reward: 1 Million Dollars!]---[Task #004: Slap your troublesome landlord with a rent receipt and say, ‘I just bought your building.’][Reward: 5 Million Dollars!]-------[Task #005: Take a beautiful rich lady you never knew to a 5-star hotel and spend one week with her. You must nut her twice or more!][Reward: 20 Million Dollars!]---[Task #007: Attend a luxury auction. Outbid a billionaire on a Rolex and walk away without collecting it.][Reward: 15 Million Dollars!]---As the world’s most dangerous and outrageous missions begin piling up—from dismantling corporations to outwitting billionaires’ most important workers and daughters—one thing becomes clear:Jayden won’t just climb the ladder of success. He’ll set fire to it and build his own throne at the top.Power. Vengeance. Wealth. Women.And one man bold enough to claim them all.

Traveling through different worlds – this is unscientific!

Get cheats – it’s science!

…

This is a simple story. An ordinary person lives in a different world, farming and raising flowers, studying unscientific science in his free time.

until the end.

- Description from novelbuddy

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.