I'm looking for the novel where this boy is reborn in a fantasy world of magic. He is super genius and fights back against bullies with magic while playing the victim. He has 3 siblings I think with him being the youngest. And he also goes to study under a hunter because he doesn't have enough food. Final detail I remember is that he has this living ring. That's about all I remember from that novel.
It sounds like Supreme Magus to me, I think he has 2 older brothers and a younger sister the family are poor and have trouble getting enough food for all the children, one of the brothers get's banished fairly early on because he's a major D. He also as you said goes to learn how to be a hunter and then finds a ring that if I remember right turns out to be the core of a wizard tower or something and it's sentient he then learns about true and fake magic and so on. He also downplays himself over and over trying to hide his powers while slowly growing stronger. He isn't a super genius from what I remember though instead he's mostly OP because he does true magic instead of fake, since the true magic was hidden and supressed because it's so strong and people who missuse it can turn into calamaties so instead the public only knows abou the fake magic.