The Classmate Who Is Adored by Everyone Smiles Teasingly Only at Me - Chapter 4V1 .1 - Infinite Possibilities of Ice Cream

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

Chen Xi looks at the soldier who just threw a rock weighing a few hundred kilograms away and looks at the sky speechlessly. Is this really the late Eastern Han Dynasty?It doesn't make sense to see Lu Bu single-handedly cut through the ten-thousand-strong cavalry.Zhao Zilong ends up truly possessed by a dragon soul. Is he really human?Dian Wei single-handedly defends Cao Cao as they storm out of the enemy camp and slaughters a few thousand cavalry of the enemy. His combat strength is off the charts!Is there something wrong? Chen Xi touches a goose feather fan and fans it. A strong gale blows and he sighs.“This must be some mythical story, right? Even I'm not normal anymore.”

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

- 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.