Reincarnated With The Undefeated System - Chapter 7 The Visit.

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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Suo Fei, a veteran NEET has spent three-days and three nights strategizing his way through the highly explicit H danmei game masterpiece “Yalance”. Furthermore, he was able to capture all nine little shous from the nine great races. However, as the final, 10P feast was approaching, he unexpectedly transmigrated. He transmigrated into the real country of Yalance…

Suo Fei: Hey, hey, hey, can you delete these files and let me restart? What the hell did Laozi transmigrate into!

- Description from Novelupdates

Suddenly I died.Because of a heart attack, right after beating the hardest game I had ever played.But when I opened my eyes, I was no longer myself. I become Tristan Althrone, the main villain of the first arc, the wretched noble who tormented the protagonist, only to meet a gruesome end.I know how this story unfolds. I know how I die. I know who will betray me.So I refuse to play my part.I won’t follow the script. I won’t accept my fate.But the more I struggle to escape my doomed role, the deeper I sink into it.And the worst part?I have to deal with her, the naïve protagonist, destined to become this world’s hero.But she doesn’t even know that the fate of this world rests in her hands.And me?I just want to survive… even if it means deceiving everyone. Including her.

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

- Description from Novelupdates