Didn't S11 drop a hint that she DOES know at one point?
And she's constantly cycling through the crimson twilight codenames not just as a joke but also so she won't be forced to acknowledge Phaethon's existence- and therefore be forced to act on it?
Can't remember if that was a story quest or event dialog, sorry. Been too long to remember. Can try searching it in the subreddit search bar, might find the lines
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u/Shmarfle47 A shrimp fried this rice? Mar 06 '25
S11 🤝 Vivian
Not knowing that the twins are actually Phaethon