Becoming Immortal Through Getting Married - Chapter 385 - : Unbearable Yin Ji

One drunken night, my friend blurted out something absurd.“Su-Hyeok, I’ve regressed.”“Regressed?”“Yeah, I’ve returned to the past.”“Are you out of your mind?”“You’re humanity’s only hope.”Then, I was dragged into the tower for real… but who cares?Regressor? Tower? Trials? What are those supposed to be?An overwhelming talent is about to crush everything in its path!

He went from an ordinary student to a god-level master in manufacturing.
Continuously progressing, processing range from hundreds of meters to tens of atoms, processing precision from microns to nanometers to atoms and molecules, everything was possible.
Wassenaar Accord? The embargo against China? What we have banned are technologies that China doesn’t care much about. Most of the member states have to import technology from China, shouldn’t the member states have a meeting to discuss and bring in China as well?
Forbidden chip sales? Is there a mistake? We barely managed to maintain our low-end market with a large amount of subsidies, it’s already good enough that China didn’t initiate an anti-dumping investigation. President, are you sick?
Hmm, it seems like living cells can be processed precisely as well. Do you need to refine the cancer cells that you are spreading out?

- Description from Novelupdates

Xion Aijawa thought his life was finally coming together. That is, until he tried saving a cat stuck in a tree, fell into a pit, and... diedIn his disoriented sate of “Freshly dead” the silly Xion accepted a strange request and ended up transmigrating into the world full of dungeons and Mana.He became illegitimate child of Marquis family hated by his three siblings.According to the memory of the original owner of the body, Xion only had a month to live.So, taking the cover of the banquet, Xion ran away. Aided by a mysterious Mall System, he makes his way to the distant borderlands, hoping to put his past behind him.But fate has other plans-. Xion ends up saving Darius Rael Darkhelm, the feared Archduke of the North, notorious for his ruthless and deranged nature.The silly Xion tried to run away but...Xion's heart thumped loudly as Darius effortlessly pinned his wrists using only one hand.“I've heard you tried to run away.”Darius gently caressed Xion's pale cheek, “That must be a lie... After all, I've given you things even the royal family can't have. Isn't that right, my dear healer?”Xion gulped when Darius's thumb brushed his lower lip as a chilling smirk remained on his handsome face.“I-I think I should leave, Your Grace. I've overstayed my welcome...”The room grew cold, and struggling Xion shivered.Darius's green eyes dimmed before lighting up with a dangerous glint.Xion felt a pit growing in his stomach when he saw the deranged archduke smile. Darius never smiled. And whenever he did, it only meant trouble.“You're right,” Darius said calmly. “So, let's get married.”Xion “...!!!!”

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?