Lowkey what I thought too like they could’ve been twins and swan was the older sister but she got all the dominante genes of their parents and Lilian could’ve gotten the recessive genes from one of their relatives like maybe someone from the moms side possibly but it really did seem that Swan was already dying from some illness I think idk but I don’t think magic exist in this manhwa from the looks of it possibly
Lillian does makes perfect genetic sense tho, inheriting hazel eyes that lighten to green from her dad and having hair that falls in between the colors of her parents is how I hose genetics are more likely to present irl, we're just used to manhwa logic where the child always gets hair color from a parent and eye color of the other one
Yeah like the guy with white and black parents turning him into ginger was dope
My theory: something like they might be twins but the pendat did some magic² for the weak twin to survive