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

From Mark's response, it was clear to everyone that he won't even apologize to the Ji Clan for formality no matter who asked him to.

Ji Cheng felt that Lu Zhen was so arrogant that he won't even put Emperor in his eyes.

On the other hand, Shang Fu felt like Lu Zhen was completely reasonable in his actions.

In his view, Lu Zhen, who is a hater of noble clans, who not only possessed a flying puppet but also a rank-8 beast and newly born beast Emperor; such person usually would have killed the kid for trying to threaten him. No one should be surprised if that happens. That's why Ji Clan should be thankful that their heir came back in one piece.

But, since he should be a neutral party without taking any side, the Emperor refrained from making any personal comment about the issue and changed the topic, "Lu Zhen, there's something else I want to talk to you. It is regarding the Kunyu bandits."

Lunch meet at the Imperial Palace (part-3)