The Earth After Rebirth - Chapter 86: Family Affairs, III

Su An was thrown into a world of quick transmigration by his suitor, who attempts to approach him with a different identity.

Hidden dangers can not be prevented, but fortunately, with sweet words and beauty, Su An has won the love of the big bosses from each world.

An indifferent painter suffering from mental illness, a flirtatious bandit young master from a wealthy family, a demon monk with powerful martial arts skills…

To Su An’s surprise: Every big boss is poking my appetite!

The big bosses who got hooked up: …

They all gave a meaningful smile.

- 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.

Lucan Ironfist came from a noble family, but he wasn't the eldest son. When his brother became the head of the family and he turned 18, Lucan would become a commoner. A strange rule, but that's how it was. So Lucan began to think of a way to live a peaceful life.As he was considering this, his mother arranged for him to become a priest in another city. A priest didn't have to worry about food or housing, and all he had to do was watch over the temple and the statue.It was easy work, so he agreed and arrived at the city. One day, as he was watching over the temple and the statue, a poor-looking girl came to pray. When she prayed to God, light gathered around her body.Lucan was surprised and suddenly remembered the plot of a certain game. Originally, Lucan was from Earth and had traveled to this fantasy world. When he was on Earth, he played a game with a plot where a merchant family's illegitimate daughter, bullied by her family, awakened the power of a saint.Lucan decided to keep this secret and train the saint so that in the future, he could have an easy life and save himself from any crises.

CEO Leng Li: The sky has finally cooled down. It’s time for that person who bullied my sister to go bankrupt.

*

Jie Ao –xianzun (officer of Emperor Jie): The emperor is not allowing me to marry my junior sister? Good! Then, both of us are going to elope.

*

Overbearing Regent: This is my little princess! What do you mean by thousand pounds of gold and precious nobles? All of you kneel down to her!

*

Tong Su only wanted to complete her task of eradicating the scum male in order to get a chance to exact her own vengeance. However, this big BOSS, why do your eyes show such emotion towards me?

Important note: Sweet pet, oppressive slag, fake brother and sister, not blood related!

- Description from Novelupdates