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

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Weapon seller in the world of magic

It was the first time Allen saw coldness from Lin Xue.

He was familiar with her cold personality but she never acted this way toward him. She was always warm and friendly.

He doesn't know why she appeared angry.

Maybe, is it because he disturbed her when she was in the middle of some important issue.

Allen learned from Mark that he cannot just come to a conclusion based on a woman's behavior. Analyzing won't work for some women as their actions don't have logic.

Allen wondered whether Lin Xue is one such woman.

As he was busy thinking about the perfect reply, Lin Xue then spoke, "I asked you a question, Mr. Allen. Why are you here at this hour?"

"Mr. Allen?" The Android was surprised once again but remembering Mark's teachings, he put away his analysis and went directly to the matter.

Shattered Illusions: Allen's Awakening to Lin Xue's True Feelings