They are filming 521 already, right?
I wonder if the 521 is the Hades centric that ends with them leaving UW , but instead of going to SB end in olympus for the episode 522/523, where they end seing again some old people that moved on, and then returning to SB at the end of 523 with some enemies following them, that escaped the real hell.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".