MTL - Diary of a Sturdy Immortal - Chapter 1255 brother

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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‘Where is the logic in transmigrating in a transmigration novel…!!’This transmigration novel’s title was “I Transmigrated, But I Became the Granddaughter of the Villain”.In other words, it’s the story of the original, REAL female lead… and I ended up transmigrating as the villainess who torments the female lead!Playing the role of the villainess who does all sorts of evil things to the female lead and then later suffers greatly?I can’t believe my life’s genre suddenly turned into a wretched tragedy without my say on the matter!I can’t live like this!‘Please save me!’But before the female lead could even appear, so many things just kept happening in front of me.“You’re the one with dirty blood. Right? I’ve been hearing people say that you wag your bum like an idiot to get food. Like a beggar.”“…”‘You’re all dead.’I, Erylotte, have transmigrated as the villainess of a wretched tragedy novel, known for its highest level of difficulty.At the age of three, I must make my way through life by using the original storyline to find my path. But…‘Ehh?’Why was the villainous duke, my grandfather, suddenly treating me well? Why did my dad, who was supposedly far away because he received the grandfather’s disdain, suddenly appear?And why were my older brothers being so annoyingly clingy?Moreover.‘What the heck.’[Erylotteeeee, so dangerously cuteㅠㅠㅠㅠㅠ] [Ahhㅠㅠ I’m sorry for cursing you out before, I didn’t know you transmigrated ㅠㅠㅠ Turns out there’s this kind of settingㅠㅠㅠ] [Gotcha, it’s a wretched tragedyㅠㅠ Isn’t this family situation almost apocalyptic?]↳ [I know right ㅋㅋㅠㅠ] [There’s some foreshadowing here… Aren’t the cookies poisoned?]I stared at the window that appeared in front of me like a hologram.‘This looks like the comment section on CoconutPage though?’Just how did it turn out like this?!

10 years searching for his lost sibling.

Seven years ago, after their breakup, he disappeared without a trace.