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

Just like every day, at 8 a.m., Allen had visited the Lin Mansion, although this time, it wasn't for a sparring session.

Usually, he would be allowed to get in but today, he was stopped by one of the guards, stating that the young miss is currently busy.

Allen was a little bit surprised and enquired with them.

The gatekeeper named Wan Fa was acquainted with Allen, and he knew the relationship between him and the heiress. So, he didn't dare to ignore him and replied in rather a polite tone, "Master Allen, earlier, a while ago, the princess had stopped by and both of them were busy with sparring. So, it might take a while. Should I go and inform the young miss?"

Allen nodded, "please do so. I cannot afford to spend time waiting. My master doesn't like it."

Inviting Lin Xue and Shang Jiao for lunch