I Became The Villain The Hero Is Obsessed With - Chapter 336:

The Saint: “Bro Yi, Can you make me your servant?

Yi Feng: “What? A Saint like you wants to become my servant. Do you have any shame?

The Saint: “My sister is very beautiful”

Yi Feng (His eyes is glowing): Little Saint, you can follow me from now. All right, remember to tell your sister to come!

The King: “Yi Feng! Your bastard, what are you doing?

Yi Feng: My bad! My bad! My king, I just want to stroll in this harem a little bit. Who knows those girls have been following me like that?

- 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.

After dying unexpectedly, she was reborn as a ten-year-old little girl in an ancient farming family, with barely a few rooms in her house and even fewer acres of land, not to mention a household of the old, weak, sick, and disabled.Fortunately, the elders in the family were kind and honest, her brothers loving and good-natured, and the neighbors harmonious and friendly. For Yang Mengchen, who had suffered from her relatives' torment and endured all sorts of mockery and scolding since she was young, this was truly a blessing from heaven.To support the family she loved, she resolutely took on the heavy responsibility of providing for them. If she, a modern corporate CEO who had once dominated the business world, couldn't feed a family, then who could?Pharmaceutical recipes, building greenhouses, opening storefronts... Not only did her family start living a comfortable and prosperous life, but she also led the surrounding villages in creating a magnificent pastoral scene!With money and fame, as she grew up, Yang Mengchen decided it was time to choose a husband, and thus, young talents from around the world began to flock to her.Who knew a grim-faced god of death would be blocking the entrance to the Yang family's home?“You're too tall, you're too short, you're too fat, you're too skinny, you're too dark, you're too pale, you're uneducated, you're deceitful and sly... All eliminated!”In a moment, the entrance was empty, and Yang Mengchen was instantly furious, “Prince, you've driven everyone away. How am I supposed to choose a husband now?”“I would like to see who dares to marry you. I wouldn't mind sending him to the Underworld as a groom!”Yang Mengchen...A certain Prince counted his merits on his fingers: “I have power, prestige, and substance, no concubines, no secret love affairs, no gallivanting— I embody the standards of a husband's three obediences and four virtues... In short, only I, this unparalleled good man, am worthy of you!”The guards: Oh wise and valiant Prince, is it really good to be so lacking in your role as a husband?

On Blue Sea Star, there is an extraordinary group of people who control all kinds of incredible power through armed cards. They are called Star Card Masters.

Su Yuan came across, and he also carried a system that can strengthen his own star card.

Transformation Realm Enlightenment Soul Card Complete Awakening = Top Qualification Soul Card [Phoenix of the Blue Sky]

Consummation-level popular walking step: avoid certain long-range attacks!

Perfect level Cang Yan Strike: double Cang Yan Strike!

Consummation-level metamagnetic heavy pressure: heavy pressure field!

Consummation level air cut: break the boundary line!

Perfect rigid flame finger + perfect hardened iron coat = golden hand!

…

Su Yuan started from strengthening the initial soul-initiating card, step by step to the ultimate realm of Star Card Master!

- Description from novelbuddy