I'm not sure as I haven't read it specifically. But generally, a 'regressor' in novel terms might imply a character who goes back in time or reverts to a previous state. So perhaps this novel is about a character who is not such a regressor and has a different kind of story, like a forward - moving adventure or a story based on present - day challenges.
I'm sorry, I haven't read this novel specifically. But generally, it might be about a sister's story in a world where she has a queen - like status. Maybe it involves her journey to gain power, deal with court politics, and relationships with other characters.
Sadly, I'm not aware of the author of 'im the max level newbie novel'. There are so many novels out there that it's difficult to know every author. You could also try reaching out to local libraries or bookstores to see if they have any information on it.
I'm not sure specifically as I haven't read it. But generally, a 'newbie' in a novel often refers to a new or inexperienced character. And'max level' might imply that this newbie has reached an extremely high or top - level state in some aspect, perhaps in power, skills or knowledge within the context of the story.
Since I haven't read it, I'm not sure. But likely there is the sister who is the queen. There may also be her family members, like siblings or parents, who could play important roles. And there might be courtiers, advisers, or love interests.