Yes you're heartless because to think that he must suffer, is not a feeling of empathy. Jiwoon is not the worst character I've seen, I understand his attitude and I don't blame him. Nobody knows if you would have become the same if you had lived what he lived. For example, a child who is beaten or abused becomes violent or abusive as an adult in most cases, especially if he has not received the support of his parents, what happens in childhood has repercussions in the life of the child. I know what I'm talking about because I had trouble trusting and loving someone too, I'm afraid of abandonment, so I totally understand Jiwoon and I can put myself in his place.Jiwoon's attitude is therefore very realistic. But you seem to think that a person must be perfect all the time, you do not try to understand the wounds of people who are sometimes very difficult to heal. So you never forgive anything if you think like that. Are you still nice in life? You never hurt someone? Jiwoon is not a monster, he just needed to live this relationship with DG to understand that he was wrong, that he could trust again, that he could offer his love to someone, DG the saved of itself. Everyone has the right to a second chance. Anyway DG will be with Jiwoon so it does not matter whether you forgive him or not.
Sorry for my bad english.
I'm so heartless, I don't feel bad for him. I still think he deserve to be hurt like this. I also think it's okay for DG to look for a new love, like he is deserve a more caring and loving person by his side, not Jiwoon.
I guess what I'm pointing out is that people should not be jerks in the first placeヽ(`Д´)ﾉ