I'm Leveling Up Too Quickly - Chapter 431 - : One-stop Service (1)

An 18-year-old poor college student tried to apply for a job as a tutor but his life almost ended as demons' meal. In his last breath, a mysterious woman gave him a strange power. When he opened his eyes he had turned into a demon with a system that would turn him into… A pervert.

Now he must lived with his dual identity as a model student named Ethan and an incubus named Damian.

Xu Xing Zhi wrote in his story: At the mountain, near the ocean was a group of villains, they are cute and clever. They are fantastic oddities of every description, they are industrious and conscientious, they want to escape from the prison.

Afterward, he transmigrated into the story. The world said: Your presence disrupted the balance of the world.

You will have to kill those villain bosses that escaped from the prison.

Xu Xing Zhi said: “Sorry, I am a salted fish.”

The world said: “It’s alright, the villain is your junior brother that you pampered from young, he listens to you the most.”

Xu Xing Zhi: …… I did not write this.

Boss with a gentle face: “ Senior brother, you love this gold necklace or this silver necklace? You slowly choose, I will listen to you.”

Xu Xing Zhi: “….. I really did not write this.

-this, was all you wished.

Meng Zhong Guang softly said: “… but if I lost Senior Brother, I really will have nothing left.”

This heart, ridding with gaping wounds, filled with pus and sore, had truly loved you before.

- Description from Novelupdates

The Blood Warrior of the Ungpae Association, who created a sea of blood wherever he went, made the world of the Forces of Evil possible.

The Nine Great Sects and the Six Great Clans joined forces to fight him, but were unable to stop him.

Four Great Warriors, who were Murim’s last hope, appeared.

The four of them fought against the Blood Warrior and eventually defeated him at Mount Song.

The time has come for the legacy of the Blood Warrior to rise once again.

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.