Reincarnated As The Strongest Ancestor With a System - Chapter 336 Second Stage

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 greatest warrior is reborn as the lowest wastrel.As the Sword Saint, the greatest swordmaster in the world, there was no place Roland couldn't go. No enemy he couldn't defeat. But pursuing strength above all else was not without consequences. The price of his power? Death at the hands of his brother, the last surviving member of his family.Now reborn in the body of Rylan—the greatest shame of the Flameheart family—Roland refuses to waste his second chance. He already had the capability and the drive, but now he also has the wisdom and knowledge of what is truly important. He won't forsake his family again.Reaching the peak will be easy. Doing so while remaining true to his newfound convictions will be much harder.There's just one problem—the criminal underworld won't let their biggest customer go so easily.What to expect:. Reincarnation LitRPG. Swordsman MC in a world of magic, but he'll also learn some magic, especially later on. Strong to OP progression. Third person. Not a murderhobo. There will likely be some romance in the future. No harem* Daily chapters while still in Rising Stars

Lin Li accidentally enters another world while playing with his smurf mage account just after he maxes out all kinds of crafting skills, bringing with him various top-grade materials. Although his character is practically powerless, what he gains in return is unprecedented magical talent! Can he survive by himself after being thrown into another world?

- Description from Novelupdates

Kim Taejune, wanted to be a “hero,” a “savior” to all the weak. After reading books about them, he too wanted to be one. Yet he lacked power, he didn't have any skills, and the command system everyone else had but one day, his dream will come true. His path leads him to encounter Yoon Harin a woman who after the death of her twin younger brother Yoon Jiho was transmigrated into his novel, “Calamity Hunter” the “god” of this world makes a deal with Yoon Harin to bring her brother back to life IF she can survive as a savior till the end.