I'm just your average college student attempting to drown his bits of free time and boredom in ensnaring novels. Maybe one day I shall even write mine!
I mean, no matter how much entertainment you have at your fingertips, after ruling the omniverse for 73 trillion years (iirc), you're bound to change a little. Tbh, besides the dynamic with Harun, I don't see that many changes (dude just threw his fourth son into a world of ghosts, who are prob not very friendly, for an undetermined amount of time). My theory, given all the hints and counterhints we've gotten so far, is that Golden Cicada used to be a Devil Prince, but rejected the Myriad Devil Palace to seek his own road. The Ancestors believed he could end the Devil's eternal reign and plotted to pit them against one another. The Devil wanted to see how things would play out, didn't expose them, and was disappointed by GC's choice. GC dies, prob killed by the Devil, but is saved by his Cosmic Law plus the Serpent Emperor's right eye. Since then he's been in a reincarnation loop, and for the good of all that is sacred, produced Harun.