Snowstar

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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Author's current works: War Online, My Soul Card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
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You can also support the Author through Patreon or buy coffee on Ko-fi.com

https://www.patreon.com/snowstar

https://ko-fi.com/snowstar5061

Weapon seller in the world of magic

The six ministers and other important officials were arriving one after another and found Mark standing silently at the center of the court. Shang Wen was standing beside him.

"Mr. Lu? What are you doing here? Is everything alright," asked the current patriarch of the Lin clan, Lin Wuying.

However, Mark didn't speak a word. He just folded his hands and stared at the throne in silence.

As Lin Wuying gestured for Shang Wen to ask what this is all about, the general of the south could only shake his head, indicating he has no idea.

The officials started murmuring as they were glancing at Mark every once in a while.

Soon, the crown prince and the third prince also arrived with the Emperor. Until Shang Fu sits on the throne, Mark was mute and turned a deaf ear to his surroundings.

I'm not here to seek answers