Protagonist Joining the Group of the Antagonist
In my novel, I intend to have the protagonist eventually join the group that killed his family and of his antagonist, and this will set the plot for a more massive arc of what I hope will be multiple books.
Is this going to muddle the hero's journey and conflict in the story? One thought I had is that in the first novel the protagonist will have a specific antagonist within the group that he will manage to kill or defeat.
I am trying to think of examples of this in literature as I know there are a few. As in GoT or other series, I intend to make my characters rather human and muddle the boundary of the typical good/evil dichotomy as to more realistically reflect the human experience.
My answer in my mind presently is to have the hero in the first novel defeat one specific antagonist in the group, or to have a broader supernatural antagonist.
My protagonist will likely reform the group that he joins