I Am the Nanny of the Villain - Chapter 12:

It was an era of war unlike ever seen before in Murim history.To end the horrible war, numerous heroes had sacrificed their lives and disappeared on the battlefield.This is the story of a man that longed to be a hero and the story of his brilliant rise to the top.***Joo Seo-Cheon is a man who luckily survives the Warring Era and becomes the Hwasan sect’s elder, only to live a life full of regrets and doubts.He lays on his deathbed waiting for the inevitable when he is returned to the past…

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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Benedict was transported to a world of cultivation and awakened the Invincible Domain system. Within this domain, he was invincible!

An upsurge of emotion, infinite fantasy, the wind waving Melaleuca, undefeated young blood! After the rebirth of Nie Yun lucky to have the ability to change the number of dantian law formula, others with a dantian practice, you use ten, one hundred!

- Description from Uukanshu