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 next day morning;

"I'll be going, Lady Song. Alina will take care of your protection and your needs. So, there's nothing to worry" Mark was at the bottom of the stairs and looked at Song Yue who is standing a few steps above.

Looking at her worried look, he further said, "You know that I, Alina, and Allen are telepathically connected. So, we will be in contact with each other all the time. Don't hesitate to talk to her."

Song Yue nodded, forcing out a smile, "Be careful and come back home safely."

Soon, Mark and Allen exited the store. While Song Yue stayed upstairs, Alina escorted them out with a little bit of disappointment as she wants to accompany her master but instead, her master asked her to guard Song Yue, which indicates the level of importance Mark puts on the heiress of Song Clan.

Shen Ling, the intellectual princess of Western Moon kingdom