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At this point most of this isn’t spoilers, it might help some of those confused to understand. Please note I copied and pasted this from when this series first started. Something may be wrong, but I found it very informative on this awesome in-depth story.
Gaiona(Dragon God) had 3 beloved children. Prokreator(most beloved child and has the power to create, revert? Worlds), Ignis(Mikhail) and Janus(Ayisha). Ignis has a lover which he killed and for that Gaiona cursed him that he will always kill his lover's soul every lifetime. Janus(Ayisha) met ML and fell inlove and had a child. But their child had a sickness that made him suffer and because of that Janus gave him a mercy killing. Gaiona also gave Janus a curse in which she will always kill her child in any lifetime. Prokreator also had a curse and I can't remember the source of his curse but basically all 3 god child had a dark core.
OG Hades and OG Janus(Ayisha) had a child, and this is Abel. OG Hades found out the curse on OG Janus and went on to defeat Gaiona to free Janus(Ayisha). After OG Hades went to Dragon God, OG Hades got killed and OG Janus heartbroken and depressed with her child went to his brother Prokreator (not sure if she asked him to reset or create an alternate world) but basically Prokreator helps her create a world where present Hades and present Ayisha is in. And OG Janus with baby Abel hops in THAT alternate world and gives Abel to the present Hades and tells him to kill anyone who approaches him and claims that they can remember their past self. OG Janus thinks the only way she can break the curse is if once present Ayisha from the alternate world claims to remember her past life then present Hades will kill her then he and their technically biological child (Abel) can live. After Janus gave Abel to present Hades (also the reason why Abel and Hades is identical lol) she dies and gets reincarnated to Korea and then dies again BUT this time with the soul of OG Janus(Ayisha) reincarnates to the present Ayisha we have. At the beginning of the manhwa we have the present Ayisha in the alternate world waking up from her funeral because....(Explanation below)
Abella is Ignis's(Mikhail) lover and ofcourse was also killed by him. Abella reincarnated to the present Ayisha of the alternate world (Ayisha doesnt have Janus soul at this point because OG Janus soul is reading mangas in Korea lol) The present Mikhail succeded on killing Ayisha by giving her the pills which resulted to her death as seen at the beginning then, OG Janus died in Korea and was transferred to now empty body of Ayisha. Thats why she woke up from her funeral. So basically Mikhail succeded on killing his lover and was surprised she revived but not aware it's no longer Abella's soul. That's also the reason why Ayisha pointed out on the recent chapter that it was Abella's memory not hers because she still has the body's memories from the previous soul.
This is also the reason why Ayisha will have 2 cores, 1 dark and 1 light. Dark core coming from OG Janus soul and Light core coming from Abella's soul
It's also heartbreaking that Mikhail chose to kill Abella before he can fall inlove with her again as it will be harder to do so.
Bottomline is Abel is Hades and Ayisha's biological child from a different timeline.