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

Ten days passed away but Song Yun was nowhere to be seen.

The Emperor sent thousands of soldiers to search all over the Imperial city; the six clan leaders, who are governing the provinces, were also notified of the matter; Mark was also notified of the matter and was offered security for Song Yue and his siblings but he refused it.

As the Emperor took this matter seriously, he called out for an all-out investigation as a seven-circle realm expert in on the loose. The Crown prince and his allies wholeheartedly supposed it, fearing that Song Yun might try to take revenge on them.

The investigators interrogated Song Yun's relatives, questioned Mark and Song Yue, Cheng Xiao, Elders of Song Clan, and everyone that Song Yun but the investigation yielded no results. Even the super powerful spy organization, "WEB" couldn't trace his whereabouts.

The Black Knight