When I Left, He Found His Way Back - Chapter 10: Subtle care?

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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Ordinary salaryman Qin Yu had a proud and talented younger sister who was the rising star of the police detectives. He often felt inferior to his younger sister with her achievements. Gradually, he began to accept his fate…

One day, he acquired the Godfather System, allowing him to obtain the templates of top villains one after another! Using the templates, he found suitable disciples and trained them.

As such, terrifying giant-level figures popped up continuously in the underground world!

[Wanted dead or alive. S rank terrorist: Joker. Reward: 10 billion]

[Wanted dead or alive. A rank terrorist: Fake Psychologist. Reward: 500 million]

[Wanted dead or alive. A rank terrorist: Martial Arts Maniac. Reward: 500 million]

[Wanted dead or alive. A rank terrorist: Crazy Scientist. Reward: 500 million]

Before he realized it, Qin Yu had his identity as the godfather of villains exposed by his younger sister! The entire world was shocked!

“There is no fairness in this godforsaken world”

- Leo

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With the appearance of the ferocious beasts and hideous monsters, humanity was on the verge of extinction.

As humanity lost its hope, a few otherworldly beings referred to themselves as ‘Gods’ appeared and helped humans in creating new cities from the rumbles.

Before leaving the world, they left a special gift that could help the humans awaken their talents hidden deeply in their bodies as there were still monsters and beasts outside these newly created cities.

With the help of their newly awakened talents, the humans started fighting the monsters and beasts on their own.

That’s the beginning of a new chapter in human history as humans started becoming heroes.

In such a world, a 12-year-old kid was framed for theft and the murder of his adoptive parents by some powerful heroes.

Furthermore, they even planned to kill him and make his body disappear to avoid future trouble.

However, after 10 years, he returned to the city with a different name to take revenge against those so-called powerful heroes while trying to find out the reason behind the death of his adoptive parents.

“I don’t know exactly who you are and why you did that, but I will find out even if I have to kill all the powerful heroes in the city.”

Standing in front of the gates of the Phirie city, Leo muttered to himself with a cold look on his face.

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?