1 Second Invincibility in the Game - Chapter 212

Chen Yan travels between worlds, ending up becoming an honorable prince in a medieval fantasy world. Yet this world was not quite as simple as he thought. Witches with magical powers abound, and fearsome wars between churches and kingdoms rage throughout the land.

Roland, a prince regarded as hopeless by his own father and assigned to the worst fief, spends his time developing a poor and backward town into a strong and modern city, while fighting against his siblings for the throne and absolute control over the kingdom. Join Roland as he befriends and allies with witches and, through fighting and even farming, pushes back invaders coming from the realm of evil.

- 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.

The salaryman who had a dream of becoming a CEO has finally succeeded.

However…

There was no one. No one was around to celebrate his success. Then on his first day of work, news of the death of a former colleague that he had laid off came. Additionally, his family left him, who was only concerned about the company.

The life he thought was right crumbled right in front of him. Where the heck did it all go wrong? Then, another opportunity came for Han Yoo-hyun, who had plunged down into despair.

This time, for sure. He was going to live properly. He was going to change it all with his whole being. The new life that Han Yoo-hyun was creating.

That valued life that will outshine any other is unfolding now!

In the darkest and most cruelest dungeon is the birth of a specie who lives his every day life trying not to fall prey to the claws of the predators.

To survive amongst predators, one most shed off the flesh of a prey and take on the skin of an even bigger predator.

Power Ranking

Note

The numbers refer to existential value, and all lifeforms has it.

ADVENTURER GUILD POWER RANKING

Lv 1 - 20 = F (1 - 49)

Lv 20 - 30 = E (50 - 99)

Lv 30 - 50 = D (100 - 499)

Lv 50 - 60 = C (500 - 999)

Lv 60 - 80 = B (1,000 - 4,999)

Lv 80 - 100 = A (5,000 - 9,999)

Lv 100 - 200 = S (10,000 - 19,999)

Lv 200 - 500 = SS (20,000 - 29,999)

LV 500 - 900 = SSS (30,000 - 49,999)

LV 900 - 1000 = XS (50,000 - 99,999)

SPIRITUAL ENTITY RANKING SYSTEM BELOW

■MONSTERS AND OTHER NON-HUMAN LIFEFORMS

●Apocalypse > 100,000,000 - 1,000,000,000

●Armageddon > 10,000,000 - 99,999,999

●Cataclysm > 1,000,000 - 9,999,999

●Disaster > 100,000 - 999,999

■HUMAN

●Transcendent > 100,000,000 - 1,000,000,000

●Warlord > 10,000,000 - 99,999,999

●Mystical > 1,000,000 - 9,999,999

●Heroic > 100,000 - 999,999