MTL - I’m Pregnant with the Villain’s Child - Chapter 21

She, a renowned assassin of the 21st century, actually crossed over to become Su Manor’s most useless good-for-nothing Fourth Miss.

He, Jin Empire’s imperial highness, was an emotionless overbearing demonic tyrant with unrivaled talent.

Everyone knew that she was idiotic and good-for-nothing and bullied her as they pleased. But only he, the overbearing tyrant with the discerning eye, wouldn’t let go of her even if his life depended on it.

For the time being, let’s just see how the stubborn versus stubborn clash and play out in this good show of the chaser and the chased.

- 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.

I was sixteen when the gods abandoned me.The Blessing Ritual was supposed to grant me power, a divine gift to carve my future. Instead, I received nothing. No abilities. No hope. Just another nameless soul left to rot in a world ruled by strength.Fine. If the gods wouldn’t bless me, I’d make my own power.For ten years, I clawed my way forward, experimenting with forces no human should touch. I pushed too far—and it killed me.Then I woke up.Sixteen again. Back at the Ritual. But this time, something changed.Time bends at my will. Blood moves when I command it.The gods still won’t acknowledge me, but it doesn’t matter. This world isn’t fair, and I’ve stopped playing by its rules. Faith and Chaos clash in my veins, and I will use them both.They wanted a Chosen Hero, someone to dance to their tune.Well, too bad for them—I’ll carve my own fate.

In Ten Heavens Domain, full of respected powerhouses, juvenile Ling Tian accidentally obtained a mysterious iron sword. He refined the Supreme Martial Dao, studied the Divine Spirit Array Laws, fought Ten Thousand proud and arrogant Heavenly Clans, and was undefeated! Seven Feet Sword Tip sweeps away the world, within the Ten Heavens, I am the Supreme God Monarch!

- Description from Novelupdates