I just wanna know who zays soulmate is

S.p.o.i.l.e.r
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Aseph is her soulmate, the reason the mark doesnt appear is because of the demon that wanted his soul. The reason why aseph was inlove with zay's sister with the first timeline its because they are twins just like how the black haired dude thought zay was his soulmate aseph thought the same towards zays sister, but in the first timeline zay died without meeting aseph.

THANK U