What's Inn's deal?

 Greek Irene:

My bad y'all I've been so bad at keeping up with this.

But I also hope that they don't just play Inn as the antagonist role and just that.

It's Okay, Welcome back! When it comes to Inn, I wouldn't put a label on her character because I understand what she is going through as far as her feelings towards her sister, I think that her character will develop since she does care for her sister and wants her sister's attention. And Irin does care for her as well, which is why she is trying to disassociate herself from Namcha due to her sister's feelings. But we all know that she can't because Namcha likes her. So, this is just a matter of miscommunication and a misunderstanding. Furthermore, it feels like Jin may have feelings for Inn since he is there with her and is listening to her problems more than Namcha has. We don't know yet, but we will see what GMM has in store for us with her character.