yes i am curious about this, how could his soul be in her body...is it more akin to the soul of his love? or is it something like his soul from another timeline, or are souls seperate from their living bodies, cause i mean generally without a soul would equal death to most people, unless its more like his soul is split?
Aseph soul is inside Zay from the very first chapter.
In the story thar Zay had read, Zay shouldn't exist right? But she was actually dead. The reason that Aseph was attracted to the so called "MC" is because she is Zay's twin. In that book Aseph soul was eaten by the demon.
Then here comes the reincarnated person from Korea, Zay is now living.... Its too long to type, you can search for novel spoilers to read it. ( ̄∇ ̄")
May I ask for the link of the novel????

spoiler alert!
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Aseph soul is inside of Zay. As you know Zay have a mark while Asepg doesn't have it.
First, they are soulmates.
Second, since Aseph soul is in Zay, he doesn't have his mark.
My theory is, Zay cry too much because she cries for Aseph part too. Specially his soul is within her. (●'◡'●)ノ