May The Rest Of My Life Be Sweet To You ( Machine Translation ) - Chapter 2 - Chapter two, you can keep her as you like

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.

A broken prince, a shadowy scheme, all that amidst a bloody fight for a throne wrongly succeeded. Join a group of youngsters as they take their first steps into the martial world, towards the grandest adventure of their lives. It all begins in a certain inn, set against verdant mountains and facing a scenic lake.

“Bring us your finest wine and best meat!” Yelled a hulking man who seemed to be the leader of the dozen strong group.

“How much?” The waiter anxiously nodded his head.

“As much as you have!” The hulking man yelled back.

“That’s…”

“HUH?” The hulking man shot the waiter a furious glare.

“Dear guests, our inn operates on the principle of ‘pay first, dishes later’. As such, it will be better if you tell us exactly how much meat and wine you need.” Xiao Se returned their furious stares with a thin smile.

“Who are you supposed to be?” The hulking man eyed him with bulging eyes.

“This humble one is known as Xiao Se, the owner of this inn, the Fallen Snow Villa.” Xiao Se replied with the same smile and with a level of courtesy worth a solid 12/10.

“Well, we have no money.” The hulking man stabbed his blade into one of the nearby tables.

“Oh?”

“But I’m sure you have some!” The man pointed his finger at Xiao Se.

At that, Xiao Se furiously shook his head. “I’m sorry to break it to you but our little inn hasn’t made a single sale in almost a month. I’m about to owe them salaries myself…”

“Like hell if I care!” The hulking man smashed his palm down on the table. “Even if you have no money, that fur coat of yours should at least be worth a hundred odd silvers.”

“NONSENSE!” Yelled Xiao Se, eyes wide open and gaze as sharp as daggers.

The hulking man was stunned, his body even shivering involuntarily for that split second.

“I, Xiao Se, ride only the finest horse and wear only the richest threads! This fur coat of mine was specially sewn by some of the finest seamstresses in the imperial capital in the August Threads. Just sewing it took three whole months, shipping it, another one. Hmph, a hundred silvers? That’s not even enough to buy the sleeves of my coat!”

When Ji Mingxia woke up, he had transmigrated as the male supporting lead in a horror novel, and had become the protagonist shou’s love mentor.

His open view of love guides the protagonist shou to embrace his sexuality; every time he appears, it’s to promote the protagonist gong’s love.

To survive, Ji Mingxia had to follow the plot.

When the protagonist shou tells him about his troubles, he gently comforts the protagonist shou;

When the protagonist shou suffers heavy physical and mental trauma, he actively treats the protagonist shou;

When the protagonist shou comes across danger, he recklessly accompanies the protagonist shou;

When the protagonist shou confesses to him, he…

The protagonist gong? Where did the protagonist gong go!

What about the supporting characters? Hurry, spare tires!

“You mean those shifty-eyed men who peek at you? They’ll never show up again. ”

Ji Mingxia: “=0=”

Please wake up, protagonist! They’re looking at you, not me!

Yu Ning X Ji Mingxia

Solitary and reclusive, sweet attacker after being tempted × calm on the surface but terrified in the heart

- Description from Novelupdates

Jun Xie was the number one assassin in modern earth. His skills and knowledge in the field of assassination were unparalleled, his accomplishments unprecedented, his reputation terrified the entire underworld. However, during a mission to retrieve a mystical treasure, a mishap occurred…

He is now Jun Moxie, a sixteen year old super level debauchee, sole heir to the declining Jun family. A family of valiant heroes, left with an old grandpa, a crippled uncle and a debauchee as the sole heir! Accepting the world’s criticism and cold stares with a smile, his new journey begins! His life will be carved by his own will! Rise to the top! Evil Monarch Jun Xie!

“This cup I toast to those I’ve killed in my past life. Forgive me, for there is no chance for you to have revenge. Gulp!

This cup I toast to those whose life I will take in my new life. Forgive me, for you are fated to die by my hands. Cheers!”