One Piece: The Template System - Chapter 20: Tempest Tact

In his previous life, because of a cultivation technique that he could not cultivate, Sword Genius Ling Dao was hunted down by the Purple Vine Holy Land multiple times. Not long ago, the Purple Vine Holy Land killed many disciple of Ling Family s. In the end, he was still suppressed by a peerless expert at the bottom of the Divine Sword Mountain. Day and night, he suffered the pain of ten thousand arrows piercing his heart!

After his reincarnation, he was Crown Prince Xiao Yao. However, because of the Sword Qi in his body, Ling Dao had become extremely weak, and was unable to cultivate. His mother had left him when he was five, in order to find a cure. His father had barged into the Celestial Dragon Forbidden Area for him a year ago and still had not returned.

The King Carefree Palace had been annihilated, Jiang Zhong fled a thousand miles away with him, and Jiang Zhong, on top of the Celestial Sect, had been humiliated … The misfortune that followed after, was that it accidentally helped him to open the peerless Desolate Immortal Slaying Force cultivation technique, and from then on embarked on a journey that defies the heavens! ” It won’t be long before I make them regret their actions! “

- 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.

Lin Luo was originally an ordinary college student. But once she crossed over, she came into the land of beasts, where the primitive forest is full of danger.

However, she met all kinds of beautiful men of different races to protect her, and got a lot of love.

Lin Luo: “Uh, different races can have children? Don’t be ridiculous. Interracial love is impossible to have results.”

A group of beautiful men: “As long as you’re willing, you can have results.”

- Description from Novelupdates

After marriage—On Valentine's Day, Han Jingnian asked, “How are we spending today?”Wrapped up in her blanket and close to falling asleep, Xia Wan'an mumbled, “Sleep.”On Christmas Day, Han Jingnian asked, “How are we spending today?”With her arms around her pillow, Xia Wan'an casually replied, “Sleep.”On their wedding anniversary, holding a cup of water, Han Jingnian asked, “How are we spending today?”Cozied up in bed, with sleepy eyes, Xia Wan'an looked at Han Jingnian, wary of the water he might spill on the bed. She thought for a moment, then replied, “With you... together.”