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

"What the hell is going on here? Didn't you tell me the other day that you are house arrested? Did your father allow you to come out? No, that's not possible. Don't tell me Owner Lu helped you escape? But, how come there's no news and…"

As Lin Xue was shocked by the sudden appearance of her best friend, she started asking questions nonstop, contrary to her cold and quiet behavior. It forced the heiress of the Song Clan to interrupt her in hurry. "Calm down, Xue Xue. Now, take a deep breath, will ya…"

"But, how did this happen?" Lin Xue grabbed Song Yue's shoulder. It looked as if she was happier than the victim who got free.

"All thanks to Owner Lu and Ms. Alina. Without even harming a single guard, she managed to bring me out." As Song Yue explained how she escaped in detail, Mark exited the kitchen but didn't go out and disturb them. He just slanted his left, taking the support of the door, and watched them while folding his arms to the chest.

Living together (part-2)