damn Seo really pulled an uno reverse card on 'em didn't she
that heel-face-heel turn she went through might've not been the most original way to go about it but i do think it fits well with the story overall. we're not sure whether her plan to do this stemmed all the way back from her pre- (fake-?) amnesia shittiness, or is more of a despair event horizon after being continuously targeted for murder despite trying her best to be a good person.
the former would make the betrayal sting more bc "she was playing them the whole time" whereas the latter would sting more bc "she tried so hard and could've truly changed if prez didn't self-fulfill his prophecy and made her snap in the end". Either way it's gonna hurt :,)
And it's easy to say prez had it coming for this but i do hope he survives. Rather he learns something from this whole thing than validating his philosophy retroactively by dying a death he at the very least indirectly provoked and drive Satsuki further into despair.