I Am A Scarecrow And The Demon Lord Of Terror! - Chapter 6 - The Pursuers Of The Mage Association

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.

What would happen if a man happened to travel back into the past where he can undo his mistakes and regret? Near in the future, an unknown being appeared and claimed that a new reality shall be opened up for humans to enter, creating havoc across the world.

However, what they didn't know is that 10 years later, monsters from the unknown void broke through the world and caused massive destruction. The powers obtained from that reality can be brought out to the real world, hence, Earth could defend itself from these monsters.

However, another 10 years later, Daniel Bell has been killed by a bunch of monsters, and suddenly he has travelled back to the past. Is this a fortunate outcome or will history repeat itself? Only the future can tell.

……………………………………………………………

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A campus bullying incident led Chu Feng to receive a message of Rong Yun’s suicide after ten years.

Rong Yun’s relic is a novel based on him…

At this point, he came to know that Rong Yun had always liked him.

In deep regret, Chu Feng returned back to high school.

This time, he wants to protect Rong Yun, his achievement and let him have a different life.
At first, he only wants to compensate for his mistakes, but he didn’t know when his compensation become’s true love.

- Description from Novelupdates

Fade was a legendary assassin that could kill just about anyone, as long as the price was right and the reason was just.

One day as he was reminiscing about his life when he lost someone important, he fell asleep. When he woke up he was in a weird place, a different body, a different world.