Moto Sekai Ichi'i no Sub-chara Ikusei Nikki - Chapter 4: Realistic experience gaining ・ Tricks of the early game.

[The time-travelling heroine who never turns around when speaking vs. the aristocratic self-effacing hero who always gets slapped in the face and is reborn]

Everyone said that sooner or later the second wife of the Shen family would be killed by the adopted daughter.

The melon seeds and benches are all ready, just waiting to watch the show.

Who knows——

Not only is he not dead, he is also getting better and better!

The eldest son became a well-known miracle doctor; the second son became a general; the younger son was smart and well-read, and became the number one scholar at the age of fifteen…

As for Shen Nian, that was even more remarkable.

She is the legitimate daughter of the Duke of the country, and everyone dislikes her for living in the countryside.

The boss of the apocalypse has traveled through time.

He has strange powers, possesses three types of supernatural powers, and is extremely lucky.

Her biological father is the Duke of Jian Zai’s heart, the leader of the Golden Scale Guard is a poor little boy she saved casually, and the bad old man who follows her is a weird doctor known to the world…

–

When they heard that Prince Xiao was leaving Zhongdu, the elite circle went crazy with joy. They prayed to gods and Buddhas in the hope that this man would die outside.

But not only did he come back fine, he also brought a girl who was even more arrogant than him.

Everyone laughed at Shen Nian for being a vulgar farm girl.

The Holy One sneered, “…you call a person who makes a people rich, vulgar?”

The prince chuckled, his eyes flashing with a ferocity that made people feel heartbroken.

The next day, the person who gossiped behind his back either had his face ruined or his leg broken…

Shen Nian stuck his head out to watch the show, “Tsk, I told you that you would be punished if you spread bad words about me, but you didn’t believe it. You should believe it now.”

Xiao Shizi, who deeply concealed his merit and fame, nodded and smiled warmly and harmlessly, “…I think everyone believes it.”

If they didn’t believe it, he could make them even worse.

- Description from novelbuddy

The notorious imperial court lackey and the meritorious military general were well-known for their mutual dislike, a pair of arch-enemies set in stone. Who could have foreseen the unexpected change in the winds of heaven: the general injured on the battlefield, both legs disabled, and even forced by the emperor to marry his nemesis.  

With one marriage edict, two people with mutual hostility are forced to marry and live under the same roof. Yet after these long days together, they come to the realization that this fellow is not truly devoid of any saving grace/unattainable and high out of reach.

- 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.

On the wedding night, she was tied to his bed.