I see no reason to support iseon. Yeah he might be a good person but he is just the opposite of the ex gf b*tch. She is a control freak and he, on the contrary was too indifferent. I bet it hurts if your partner does not give back the same energy. If he loved her, he would make an effort at some point or at least look for clarity about why she broke up in the first place.
Hyondo and yumin on the other hand, have a nice comfortable chemistry. They understand each other, neither clingy nor distant. I totally root for them. Having second lead syndrome, I hardly root for mcs
It's just my theory based on some couples I saw irl but there are guys like yoon who are just as mean as they express. They cannot be meaner than that and sometimes it becomes difficult to be nice to their partners for them. Ofc I am not talking about the abusive psychos, these type of people are just mean, nothing else.
He used to have those bags under his eyes, look at him now