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

In the eyes of the crown prince, Mark might not be strong enough to defeat the entire imperial army, but his weapons could definitely kill him. Shang Zexi loves his life, and he wants to be safe than sorry.

Mark was also quite surprised by how convincing the crown prince's story was, but he had something up his sleeve to counter that.

Turning toward the crown prince, he then replied, "Suppose you are sleeping on your bed. Suddenly, someone tries to kill you but you escape and catch the culprit. The culprit turns out to be Allen. When you confront Allen, he says that he was ordered by me. Then, you come to me and I say that I was given money by someone to put a bounty on top of you. Even if that someone gets caught, will you leave me and Allen if we simply apologize and say it wasn't on purpose? Or you will put us under trial?"

"That's…" The crown prince fell into a dilemma, whether he should abandon Nie Rougang or not.

Forsaking the homeland