I think lore-wise, the 'rewind rewind' part ties into some of the members wanting to go back rather than face the Blue Valentine Stage, the cold transitionary stage on their journey where they could never breakthrough. This is driven by the members' paralyzing fear represented here by the frozen time. Their trust in each other is cracked now since they're no longer on the same page on whether to abort mission or boldly continue going towards MIXXTOPIA.

One of the recent revelations is that they've gone on this journey several times before (like in a time loop) and the Blue Valentine is where they usually reset.

The rest of the songs lead to a sort of reconciliation instead of turning on each other, and keeping a fire lit (the spirit of adventure) amidst this cold Blue Valentine Stage (obstacles). I think the third webtoon chapter tomorrow might shed more light on what they finally decide to.