But what if Lilith and Lily are actually the same person and the baby in the flower thing is actually a rituel that permits Lilith to never die by a system of reincarnation but since Min took the the flower too soon, her memory didn't pass directly to Lily as it should have been and like Hill who has been sleeping to the point an other personality grew which is Doh Hyun, Lilith did the same with Lily...
Or what if the baby in the flower thing was a last resort for Lilith because she got too damaged from the fight against the blue lady(I realized I like this theory better)
But yeah I agree she definitely wouldn't be his mother, it would be too weird and that means she wouldn't be her waifu(well technically she could but that would be awkward)
So they Mother and son?