Also agree with the other comments that this arc feels weird and a very forced attempt to make us sympathize with Prez despite there being no justification at all, in addition to Seo's turn being literally out of nowhere apparently just to give them a justification which was never present in the manga so far.
It's also completely ignoring the content of volume 6 and going in a completely different direction with no acknowledgement of it whatsoever.
Maybe the author is planning to pull a reversal of the recent events. Or they didn't know where to go in terms of content and wanted to change and spice things up, even though it made no sense with what had happened before. Anyway, this volume has been fairly disappointing. We'll see what the remaining chapters have to offer...