Tbh i think author just wanted to make our delusion true thats why in epilogue he made it seem like they were all alive and Rai had gone missing again..
But as we have seen in ch 543, they died while saving humans from that nuclear missile, bcz when nobles die their body/soul get dissipated into red fragments and those humans at the end were like "what are these? These are so beautiful" while watching the red fragments...
I can't bear it, that they died like this...atleast author could've said that they reborn again like in few years or centuries
Sorry thats why i decided to ruin ur peace too by telling you what i am feeling.....
My mind just can't accept that they are living peacefully and Rai disappeared again after watching that fragment scene

i cried bc of ch 544 cuz i thought rai died wdym he and the others lived after tanking that missiles especially when muzaka and rai's life force is already spent and their bodies aren't in a good condition? i'm so confused. but i'm happy to see him alive don't get me wrong, i hope nothing goes wrong again so he doesn't have to use powers and just live a peaceful life with the kids