I'm searching for a novel where the male lead's family continues their bloodlines by marrying their sisters? or women who meet a certain requirement to get pregnant. Female lead is infertile due to eating some type of herb since her first period but knows how to cure it as she time traveled. She got the cure from the male lead's family doctor in the future after the male lead dies and ends his bloodline.
agh this is really familiar but I haven't read Korean titles in a while... at least I think this is a Korean title I think this is Lucia...?