^^the problem is that pain and suffering are 100% bad feelings (unless ayu were a masochist
), but what masa implied is that it has to be somthing that conveys a bittersweet feeling, that something seems sad but still holds its beauty. I can't think of a exact word that alone conveys such a feeling other than "nostalgia", whic halso includes feelings of missing something, but that's only related to wondering about the past, not admiring something from the present.