She seems very immature
Exactly. I think this is unfair for Seojun. He loves her, like very much... And well, she only notices him because Suho was far away and didn't contact her... This makes me question her feelings like... did she really loves Seojun? I don't know if I am a romanticist, but you know... If in the end, Jugyeong and Suho are the pair and Seojun is the second lead, I prefer that the way that Jugyeong and Seojun break up makes sense... Not like... "OMG, I can't stand this situation... I am going to break up with him, but I don't want to talk about my feelings with him"... It's totally unfair!
In my honest opinion, everything is very wrong. Regarding fanbases, I won't even comment. My point is Jugyeong. She didn't speak to Seojun. She didn't talk about her anguish, the hates she's receiving, nothing. The only thing she mentioned, when meeting him, was that she found someone from his company. That's it. She didn't say anything, she is suffering alone and has sometimes considered breaking up with Seojun. I can understand that she is sad, anguished. However, in my reading experience, she kind of gave up without a fight, you know? She didn't sit with him to talk about her point of view, his opinion about it. I hope that in the next chapter she will bring her justifications, they will talk and at least try to be together so that if there is no way they can be together, they will break up and not give me the feeling that there was no attempt to make it work.