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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Weapon seller in the world of magic

"So… do you agree to this proposition?" Mark steadily gazed at the girl who couldn't understand the reason.

In response, she commented while staring at the ground, "You would unnecessarily offend the Wuji sect if you help us. Is there a need for the senior to go to such lengths just for a meeting?"

She was kind enough to think of the welfare of others but not everyone would reply in kindness. Mark wiped off his smile and sternly told her that it is a matter of adults and she should only answer with a yes or a no.

Dong Fang tried to support her but Mark also acted coldly toward him, stating that it isn't his place to answer unless he can take decisions on her behalf.

As Dong Fang shut up his mouth, Zi Ling bit her lip and slowly nodded, "Yes, I promise. Please seek justice for my seniors."

The unfortunate crown prince (?)