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 cheering of the spectators stopped and everyone turned their heads to look at the source of the voice.

"Father?" Song Yue's eyes were widened in surprise as she spotted Song Yun standing on a flying sword with hands on his back. His expression was rather serious.

"Minister Song?" The Emperor stood up from his throne. The Supreme Commander and the Grand Secretariat followed the suit.

"Even if he didn't let go of his grudges, he shouldn't have come now." The third prince twitched his lips. Despite how he didn't get any role in this trial, still, his brother was punished, and his childhood friend Song Yue was served justice. But, then, this man had to crash the celebrations.

The third prince was aware that Song Yun woke up but he kept silent because neither Song Yue nor her father wanted to reveal it yet.

Song Yun challenges Mark