MTL - Supreme Little Fisherman - Chapter 7 hope and disappointment

Fate, a gatekeeper who had been working for the castle, is beset by a few burdens.

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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This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

It’s 2100, and Vincent Carter – Ying – is a twenty-year-old virgin with a penchant for profanity, he has but three guiding principles:“In a world where honour and valour seem like unaffordable luxuries, cowardice remains the pragmatist’s ultimate virtue. Spinelessness isn’t shameful, it’s simply self-preservative romance.”“Doubt is unironically the cheapest superpower a person can have, after all if it’s human, it’s probably plotting something. And if it’s plotting something, it’s probably hiding something. And if it’s hiding something… well, you get the idea. So question everything, one sceptical step at a time.”And lastly,“Muscle heads – because who needs brains when you can just flex your way through life? Couldn’t be me, I’ll tell you that much.”Armed with nothing but these… questionable (?) values, as well as experiences shaped by a hellish life in the slums, Ying dives headfirst into the latest VR sensation – Cultivation Climax, a world brimming with great magic, ancient mysteries, and blood-curdling conspiracies just waiting to be unravelled.However, because Ying’s life is just that kind of special, he is greeted with a rather ‘lovely’ surprise upon opening his eyes to the new world…Ding![Your misfortune is truly astounding!][You have awakened the absolute WORST talent for Cultivation!]‘…’“…W-what?!”Yes, what indeed.