MTL - For My Sister, I Became the World Boss - Chapter 12

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 well-known and recognized throughout the Stern continent, strong and mighty, as well as the unique Wizard of magic cures, the most outstanding genius of the whole continent, Jason got into the flow of time, back in the uncivilized era during the first failed experiment, 3000 years ago. This was the period when the magic healers didn’t exist. How will Jason apply his knowledge in this backward era, wherever he reach the peak of glory?

- Description from Novelupdates

Princess Leah wrote a suicide note ahead of her wedding.

Su Shi was once a platinum-level host with the highest survival rate. One day, his misdeeds of constantly shifting his blame onto others was found out and reported. Convicted of violating the rules, he was bound to an Automatic Blame Shouldering System and exiled to lower-level worlds.

Now, not only does he have to take the blame from others and shoulder it himself, he must also carry that blame and rush to his death in order to earn enough points to quickly unbind from the system.

Su Shi only wants to get rid of the system by shouldering the blame until death. However, he finds that trying to hold onto the blame is even harder than passing it on, and rushing to his death is even harder than running for his life.

As Su Shi lies dying in the protagonist’s arms with red-rimmed eyes and a weak and helpless countenance, an uninvited third guest suddenly rushes out to explain the misunderstanding for him.

Su Shi: “I beg you, just let me shoulder this blame, otherwise, it will all be a waste of effort…”

- Description from Novelupdates