Isekai Maou to Shoukan Shoujo Dorei Majutsu - Volume 7 epilogue

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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This novel is about the young master of the Du clan, Du Shaofu, who was born with crippled veins and is unable to cultivate martial arts . After finding out about his situation from the clan while returning home he got hit by a lightning and a mysterious ‘first scripture’ appears and after studying for ten years he was able to mend his crippled veins together and starts his journey to glory.

- Description from Novelupdates

“I prepared for this day. So you have to understand.” The strongest player, Lee Suhyuk, is betrayed by a trusted friend during a tower raid. As a result, he lost all his comrades and met his death. However, for some reason, he woke up 20 years later. “The same approach won’t work.” Faster. Stronger. To achieve that, he needed points. Suhyuk decides how to earn points early on. “Cosplaying as Lee Suhyuk is trending?” 20 years have passed, and Lee Suhyuk has become a legend. He didn’t know much about streaming, but if it’s imitating Lee Suhyuk, he was confident. After all, he is Lee Suhyuk. [‘Lee Suhyeok’ has started streaming.]

I was transmigrated into a webtoon based on an alternate history of a shitty empire.‘I will overthrow this country with my own hands.’And the answer I arrived at upon experiencing it was ‘Coup D’état’.