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 district of Qintou is another affluent neighborhood where mostly the branch family members of several major clans live together in harmony.

It might not be as luxurious as the district of Qidong where the original Song mansion is located, but is nevertheless, a great place to live in.

Here, Song Yun used to have a guest house but now, it became his residence while the construction of his original mansion is taking place. It only took a few minutes for Mark to raze it to the ground but rebuilding will take months.

Until then, he had no choice but to live here as he doesn't want to buy a mansion in the Qidong district and humiliate himself.

Just like the past couple of weeks, the residence was heavily guarded by the upgraded security. There are about 30 guards with the weakest in the 4-circle realm. Three of them were even in the six-circle realm. Of those three, the new security head is at the peak stage.

Alina infiltrates the residence of Song Yun