Crossing the Other World to Build Gundam - Chapter 995: lost heavily

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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Lady Bertia, who’s become my fiancée, is a bit odd. On our first meeting, she proclaimed herself a villainess noble girl who’s been reincarnated and said that she’s working hard every day to become a splendid flower of evil that’s elegantly put in her place.

I don’t get it.

But she entertains me because I don’t understand.

That’s why I think I’ll observe her for a while.

This is a story of a crown prince who’s so talented and handsome that he’s grown bored of his easy-mode life. A story of this prince observing a self-proclaimed villainess noble girl (who seems perfect at first but is a bit off) who’s become his fiancée as she snatches flags and breaks them into pieces.

Among the demons, the supreme ones are called “Great Saints.”

A young man leaves his mountain village and travels around the world. By unceasing efforts, he finally becomes a legend of the age.

- Description from Novelupdates

A 23-year old man who graduated Harvard flew back to his home country to sell fried goat meat in his self-made small stall, representing a conservative generation of youth. He went to a bar looking for a girl to settle his lust and found a drunken beauty.

They spent a wild night with each other, and the girl coldly and silently left in the morning in front of the guy’s face, leaving a small red stain on the bed sheet. After a few days, she forced him to marry her for 2 years by contract, and after the contract expires he’s free to do what he wants. She later revealed to him she’s the CEO of one of the biggest corporation in the country.

Will a girl with the burden of a giant corporation with her own emotional scar be able to find love and to share the person she loves with other beauties?

Will a man who lived to kill his entire life, with the burden of being Hades, one of the 12 gods of Olympus, be able to set aside his responsibilities to live with the girl(s) he loves or to improve his godly skills to protect everything he cares for from an unseen threat?