This regret and obsession spread as he shattered his soul together with his beloved. At the same time, Hunluan's undying love and sacrifice for him had also spread and shattered after his death.
Thus, the obsession and remnant emotions of these two ancient gods remained and split into their broken soul fragments, giving birth to an endless struggle of love, obsession, and sacrifices within the madness and chaos their origins had possessed. This continues to the present timeline of those who were born from them.
That's why the fragments of the world eater are obsessed with loving the fragments of Hunluan, the Ancient God of Chaos. The only fragment of Hunluan that received his undying love and sacrifice is the bloodline of the Mo Clan, which was said to be born from the chaos itself. It's because of this reason that the curse of their family only being able to fall in love with one person stems from this origin.
