MTL - Give Me Your Hands and Marry Me - Chapter 260 Island secrets

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.

Leon a young man with the heart of a killer, did something unspeakable before getting transmigrated to another world.And what's more? He found out that due to a wish of his, he got transmigrated to the body of an incubus!And he got into the body at the worst possible time!Something happened, he managed to escape death and became the last of his race...he gained the Vice and Valor System,Lewd and immoral act could give Vice point while battle and bravery can give him Valor Point...This world has magic and beauties that none in his previous life can compare.Join the exciting journey of our MC as he gains immense strength and conquers the most gorgeous girls!

Suddenly finding herself in a rural setting, Lin Caisang became the village's renowned 'Star of Wealth and Honor'. Surrounded by unique relatives, they treated her as if she were a rare panda—held preciously in their palms for fear she would fall and gently kept in their mouths lest she dissolved.Meet the exceptional relatives:The Powerhouse Father, who declared, “You want Sangsang to get married? You'll have to get past me first.”The Stingy Mother, questioning, “What does she need a husband for? She can have all the fine food and a carefree life with me!”The Sly Grandfather, suggesting, “Girls shouldn’t have to do the dirty, tiring work. Quick, call over your brother!”The Majestic Grandmother, fiercely proclaiming, “Who dares to bully Sangsang? Let them face a fight to the death with me!”The Protective Brother, assuring, “Little sister, all the good food is for you. I am not hungry!”Holding her flabby flesh, Lin Caisang wept without tears: “Let me go! I need to lose weight!” Meanwhile, the strikingly handsome, icy man next door not only protected and spoiled her in secret but also had a not-so-simple identity.....

Earth Online – a virtual MMORPG that takes place in the future year of 2190 – a game that everyone will bet their futures on. Set in a map that is ten times the size of real-world Earth, players battle for supremacy in the first game to feature personal adventure, territory construction, and grand warfare. For every death you experience in the game, your level would drop back to zero. Ouyang Shuo, an above average player, suffered the ultimate betrayal. For merely a piece of equipment, his sworn brother betrayed and backstabbed him. This time, after he reincarnated in the game, Ouyang Shuo swore to exact vengeance.

However, in an unexpected turn of events, Ouyang Shuo found himself back five years before the betrayal – right before the launch of Earth Online. This time, armed with the knowledge from his past life, Ouyang Shuo would venture upon a new path.

How to perfectly complete quests? What historical battle maps would appear? How should one build up their territory? Utilizing the experience from the predecessors of his last life, Ouyang Shuo makes his bid for the top against all odds. Follow his journey as he seeks to lord over the world!

A different kind of tale that blends historical characters and virtual reality gaming, with heavy emphasis on kingdom building and warfare.

- Description from Novelupdates