That Arms Dealer Was from Hogwarts?

[Cruel and even more ruthless + no female protagonist + English gentleman + cool]

Dumbledore never imagined that a letter of acceptance to Hogwarts would lead to him becoming an arms chief.

That was the 11-year-old boy named Alan Shelby.

That's the only arms dealer in Munich!

There is one more person in the world who is hunting down Voldemort all over the world.

There is one more person in the world who is trafficking arms all over the world.

But that doesn't matter.

The most important thing is Harry! (gritting his teeth in anger)

Harry: Ron! This thing is much better than a wand!

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There is no female lead, the introduction is weak, please move on to the main text.