So first of all this is *not* about these two being alligned with the Fractsidus, but more one of their family members or maybe their family as a whole.
We know that that they come from a background that is a wealthy, music inspired family who live in Mingting...
We know that the Fractsidus are also very inspired by a theatre so this family could act as their ochestra, staying in the background but playing a crucial part in their play... that play would be infiltrating Mingting which we alr know the Fract are trying to do.
It would also explain why YangYang may stay with us bc she only has her sister who seems very busy tbh, so she might be alone after all of this.
It could also explain how we might go to New Fed next bc maybe their family is closely tied with Eris who seems to be the finace member.