Sendai Yuusha wa Inkyou Shitai - Chapter 80 – The Preceding Hero and the Agent

Travel to the world of One Piece?

They come, the security;

Became Don Quixote Rossindi?

Forget it, it can’t be reopened;

But after realizing that he had eaten the fruit of silence, the little boy became restless.

Fruit of Silence, this is one of the devil fruits that can compete for the title of “the most useless” in the world of One Piece; it is only a little better than Chopper’s “Everyone’s Fruit · Common People’s Form”!

“Dover, you said you are a devil fruit wholesaler, why do your family eat all kinds of weird ones?”

Facing the bewildered little Dover, Rossindi patted his forehead.

“Forget it, let’s practice domineering hard.”

- Description from novelbuddy

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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After 50 years of being in the position of Hwacheon Clan Leader, Kang-hyuk, widely renowned as 'The Dragon' retires.

That year…

Zhou Yang, an honest man who just got his driver’s license, crashed the camera of the Caotai crew. With no money, he could only sell himself to the crew to do odd jobs. I originally thought that if I worked until the film was finished, I would be able to regain my freedom.

However! ! !

When the swindler director ran away with the assistant director, and he was almost regarded as a fraud accomplice by the long-legged beauty investor, the honest Zhou Yang was dumbfounded.

“I’m on top? What do I take on top?”

“God, my major is electronic information technology. I’m just connected to wires. I don’t know anything about making movies…”

“…”

- Description from novelbuddy