I wouldn’t be surprised if the isolation was on purpose (esp the “no talking to other members”), there’s a psych tag but no supernatural so maybe it’s more of a cult thing than some ritual sacrifice , Tho the last chapter of showing that skinny idol looked borderline anorexic imo or at least her eyes were also dead inside
Dang 45 kg is like 99 pounds ,I think that’s tech underweight , tho I guess not by Asian standards (but man I haven’t been under 115 since high school tho other than chubby members standing in the group im surprised not To see more upcoming actors/idols or so)