
Okay so I read the novel really really long ago. But I'll try to recall as much as I can.
SPOILERS!!!!!!!!!
So basically Shah-in during his time as a mortal was sacraficed to Amon(who at the time kinda got obssessed(?) with Shah-in) by a cult who worshipped Amon. Amon kinda literally killed Shah-In's whole family(or killed by the cult i dont even remember) and Shah-in got killed by the cult so obviously Amon wanted to save Shah-in so he LITERALLY swallowed and ate up Shah-in to transform his body into an immortal. The city we see that is blessesd by Amon is literally created by Amon just for the sake of Shah-in, who during his mortal time mentioned that he wanted to live lavishly and be surrounded by luxury. And now we see in the manhwa that they are using some sort of incense to wipe out Shah-in's painful memories since he has suicidal tendencies and basically goes crazy when he remembers what happened to him. I forgot the ending but what I remember is that the pink haired guy, amon and shah-in like are kinda with each other and shah-in becomes invisible . Man it was a long time back, the ending was crazy. Sorry for my bad explanation.
SPOILERS NOW PLEASE PLEASE