Heavenly Jewel Change - Chapter 814

Sein was only a child when he was abducted from the surface world and forced to join the Black Magic Academy. In the Underworld, strength reigns supreme and the weak struggles to survive. As the death toll of magic initiates continues to rise within the walls of the academy, Sein’s quest for knowledge and power is a constant battle for survival.

Memories of his parents and the starry night sky in the surface world are fading with each passing day in the Underworld.

“Is Magus World the name of the world we live in? Where is my home in the Magus World?” These are the burning questions that Sein has in mind.

Will he be able to rise to the pinnacle of power, discover the truth of the world and ultimately find his way back home?

Official blurb:

He hails from the banished land of the Underworld, bound by a single unforgiving rule—survival of the fittest. He is the seeker of truth, a mage who treads the fine line between sanity and madness. In a world where myths have crumbled and chaos holds sway, it is strength that reigns supreme.

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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.

Shen Yan insisted on marrying this Fu Hang even at the risk of being abandoned by her family and relatives. She thought that after three years, she would be able to melt the ice in his heart. However, when this man detained her and forced her to kneel in front of his family to confess to mistakes she never committed, Shen Yan realized that this man’s heart was made of ice. When she fell into the water alongside her elder sister-in-law, Lin Xing, Fu Hang jumped down at the first moment and saved Lin Xing. He carried Lin Xing to the hospital while Shen Yan, who did not know how to swim, could only wait for the guard to save her. The child in Lin Xing’s stomach could not survive the ordeal and she had a miscarriage. Fu Hang brought Shen Yan to his family without any explanation and asked her to kneel and admit her mistake. His eyes under his sharp brows were piercingly ruthless as if he stabbed a knife into Shen Yan’s heart. “After Big Brother passed away, he only left a child behind. You shouldn’t have killed this child!” “I didn’t do it. She jumped down herself!” “What are you waiting for? Kneel and admit your mistake!” Three years into her marriage, Shen Yan was convinced that even a dog was more valuable than her in the Fu family, what more Lin Xing who Fu Hang really loved. Right before one of her kneecaps was about to land on the ground, Fu Hang still thought that Shen Yan would admit to her mistake. Little did he expect Shen Yan to slowly straighten up and said, “Fu Hang, let’s divorce. I’ll just pretend that I fed the past three years to the dogs. Nobody is worth wasting my youth on after this!” Therefore, Shen Yan decided to return home and accept her inheritance that was worth hundreds of billions. A glorious life awaited!

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates