I read Never Understand a long time ago so I can't say anything about Ayeon's abrupt personality change...
Meanwhile the gf, I think Ayeon had given her many chances to change (he said "This really is the last time" [or something along that line n_n"]. So I guess it happened many times before...). And I guess if Ayeon still w/ her, it would be counterproductive... Like, they're toxic for each other (gf thinks she can get out from any mess and Ayeon will still be like before).
What the gf needs is to meet someone new (and has a good heart), like when Ayeon met Woori :)
I see, you have a point. Thank you for pointing it out! But I guess not everybody can have a happy ending. Like you said, maybe the gf really does have to find another ^^ I'm just glad to see Ayeon heal and grow at this point. TuT
THIS WILL DEFINITELY BE MY FAV PAIR!!! I commented on the last one how I wished Ayeon to heal and Im so glad to have found this. This is exactly what I needed!!! I'm also glad that Jaerim and Ayeon still are friends huhuhu. This story, I think, is really good and solid but I'm just a bit baffled by the fact that Ayeon's personality/character seem to have changed from the main series. That was totally fine by me if maybe there were some more detail as to how he changed? Like, on the main series, I tought he has more spunk, and never did I pick up from the there his softyness so I'm a bit shocked by his personality in here. Like I said, I dont hate it, I just wish there was some kind of transition. But overall, I super like this pair. It has some very good emotional weight. They both found each other and have grown and healed together. :))
Now tho, I know how bad and toxic Ayeon's ex-gf have become. But still, I can't totally hate her, ((moreover because of their backstory)) I just wish for her to heal as well... Also, I would have been happier if Ayeon at least tried to stay with her and protect her. Not the way he did before, but just keep her from being hurt more? I mean, afterall, just like in Jaerim's case, every issue they have all rooted from negative feelings brought by pain. It just feels sad to think about the ex-gf being left like that. ..Don't you think so?