Okay, so here is my pov on this XD, note that I haven't read about the discussion (sorry, I woke up and literally didn't have time) so my opinion will not support who or facts, just my own opinion and you're being warned, this is going to be a loooong post XD
The thing is, we all know Sumin’s pov when that happened, we all know how despaired she was, how sad she was, it was described very clearly for us to understand but we know nothing about how Seju felt, we can only guess and guess and…blame her for everything XD but lately, I’ve realized this, thanks to all the flashbacks in arc 3, Seju has always been so insecure about her relationship with Sumin since the very beginning. She’s so afraid of losing Sumin, the one and only person that matters in her whole life. So let’s put it this way, the moment when the cheating happened, an insecure Seju who was always afraid of losing Sumin, for one or more than one month I don’t know, had to deal with the fear of losing Sumin - her only source of happiness for good, afraid than ever when Sumin showed signs of blaming Seju for everything that happened (note that I don’t say Sumin blame her for real or not, I’m saying Seju THINK Sumin blamed her for this and I believe no doubt Seju indeed felt that way, based on the conversation). Seju had to deal with a girlfriend who was wasting her life because of the passing of her parents and the fear of losing her for good and being accused of the reason for her lost XD. I understand why she told Sumin to move on, I wont question that like other people, simply what else could you say? Let her ruin her life and continue to drink her day away while stay on her side? How useless and powerless of you to let her do that in front of your own eyes without telling her to get up and move on? Even if it’s just one month? What I wonder is why she asked for the ring right after that and now I think I got my answer. When I realized this, I started to understand more Seju’s actions, beneath that strong façade, lays an insecure Seju who’s always afraid of Sumin so when she saw her taking off the ring, her fear grew bigger than ever and that’s why she questioned it without thinking much about the situation Sumin was in, it’s an instinct, that’s also why she looked so depressed when she drank wine. Note that, at that moment, Sumin only began to have Seju as the only person she could rely on but to Seju, it has always been like that since the beginning and for her whole life. The fear of losing Sumin might be unbearable. Just so you know, I’m not defending her =)))))), I’m just trying to understand her XD. Not like Sumin, we can only guess how she feels in that matter anyway, the author doesn’t give us much
Oh, in case, I want to say this to:
The chap when the cheating happened, I’ll be honest, I didn’t read it much, just one or two times, when the chap first came out and one more time to understand the story. And I read it when Sumin was my favourite and Seju was far from a likeable person at that moment. But when I read it, this came to my mind first and foremost, Seju was at fault but to me, she didn’t do it on purpose and that was the me who didn’t favour Seju at all thought, so I hope it’s a fair judgment XD. To me, back then, when I read it, Seju was all to be blamed but I don’t consider it at sth to judge her or hate her, because she didn’t do it on purpose and she was in distress XD.
Other things, like she’s being drugged, and sth like that, I don’t really pay attention much since they’re just theories which we cant prove it true or not until the moment the author reveals it XD, I only base on my own feeling about one scene when I see it and this particular scene, to me, is like that, right off the bat.
