Spirit Realm - Chapter 1821: Disaster Arrives!

To reward Meng Fan for his bravery before his heroic death, the cosmos rewarded him with a ‘system’, sending him back in time to three months ago, alive.

- 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.]

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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Luo Yi, a high school dropout in his original world, was isekai’d into the world of the Witcher 3. Starting out as a weak boy named Roy in the village of Kaer, Lower Posada, he was determined to grow stronger, no matter what it took. The first step toward becoming a legend was to kill. And his first kill was… a rooster. ‘You gain 1 EXP.’ Of course, Roy had his own cheat system like all the other isekai protagonists. His first step to becoming a legend started now…