[ Wei Wuxian's response comes as he chews through a mouthful of fish — ]

Easy. The ghosts aren't from this realm, they just end up here. If they're kidnapping us from our realms, why wouldn't they do the same with their dead?

[ Sure, some of them have no memories of being anywhere else but here but that's an easy thing to explain away. If this is a realm that isn't the underworld or the earthly realm but something other, then it's easy to guess that the ghosts populating this place must've been pulled from elsewhere too. Probably along their journey to the underworld proper — and out of the cycle of reincarnation, which is a problem. ]

... Though I'm not sure there will be corpses here. This isn't real, right? So... why would there be any dead here either.