their faces changed?

Jiwook's is supposed to change. Atp in the novel he's meant to be way skinnier (in the manhwa he didn't change as much physically cuz he still has muscles) plus his expressions look different bc he was arrogant and cocky in the beginning and now, due to the trauma + mindbreak etc he mostly appears to be fearful, anxious and self conscious, so it makes sense. As for juyeon i didnt notice anything