Sword, Magic and Academic Society - Chapter 15Vol. 1 - - Crafting Connections in the Class Tapestry

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.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Rumors say that if you ever come across an extremely handsome man in a doctor's coat twirling a shiny scalpel between his fingers with an alluring smile on his lips that takes your breath away…Run.For he is the devil.***Yang Mingshen’s existence screams of six adjectives - Handsome, wealthy, talented, narcissist, arrogant and evil.He is an unrivaled doctor from one of the most affluent and prestigious Underworld families, who sees only medicine and his own interests. Until a desire consumes him - to have a woman’s heart.That woman, Song Jia, continues to put all the wrongs to right as a capable police officer. She, whose life was once saved by the devil doctor, refuses to bend to his tempting seduction.“I will just take your heart and put it in somebody else's chest. It won't hurt at all, I promise~”“Yes because I will be dead to feel anything.”But the bad news comes knocking when Yang Mingshen becomes the lead forensic investigator to assist in her cases. With a devil now clinging to her, she comes across a deep, dark and cruel web of conspiracies stained with blood, love, hatred, revenge, politics and much more.Treading into dangerous territories, will they be able to uncover the net of lies and deceit? And maybe find love along the way?*EXCERPT*“I am not the weak patient anymore. You try to grab my neck and I will break your wrist,” Jia threw him a death glare.Mingshen leaned in closer, chuckling devilishly. “I told you before, Spicy. I have saved your life. I have touched your heart quite literally. So that heart beating in your chest right now belongs to Yang Mingshen. If I want it, I will have it.”

One day, I was given the mysterious power of Hwanmong.