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

https://www.patreon.com/snowstar

Weapon seller in the world of magic

"Oh! Hey Alina, Lady Song will resume her stay here," said Mark as soon as he spotted the female Android.

"Eh? What's going on?" She was taken aback by surprise. She was thinking that everything will go the same way as before once Song Yue leaves but this girl returned?

While the Android cannot access Mark's memories without his permission, she can connect with the system. Unless it is necessary, she wouldn't do that. It is why she just waited for Mark's return without enquiring why he and Allen left for a quest without taking her.

Now that she became curious about the matter, she accessed the system's Quest log and found the details. From there, everything is easy to understand, although there's still something that bugged her mind.

She didn't ask any questions and quietly escorted the two of them upstairs. Alina get back to the bedroom she was familiar with and so, was Mark.

Are you ready, Manager Song?