Harry Potter: the Strongest Silent One

He was reborn in a British family with a superior family, but as he grew up, the protagonist discovered that he and his sister actually had super powers, which he carefully suppressed at ordinary times. As he grows older, his strength becomes increasingly difficult to suppress. After a super-powered rampage, he killed his parents, leaving only the brother and sister to depend on each other. One early morning, a letter made the protagonist fully understand that he was traveling through the world of Harry Potter, and that what he possessed was not superpowers but magic... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.