In Difag's singing group, for instance, they are all relations of some degree, sisters or husband and wife. If Difag were to try to sing with someone else, it wouldn't necessarily work out.
例如里望的歌唱群，都有或深或淺的親族關係，是夫妻或是姊妹等，會唱歌的里望，若是跟其他的歌者搭配，不見得唱得出來。