reika's manga / #Manhwa(1606)

Second daughter (FL/MC) is horribly neglected by parents bc their first daughter suddenly went missing and ended up making another child(FL) to keep the family going. In doing so they abuse her mentally and sometimes physically and no one who works there really cares about her. Years later, they end up finding the older sister and then they start taking away FL's life (wanting the FL's fiance to be engaged to older sister, wanting attention to be given to older sister only etc). Thankfully ML (the fiance) actually likes the FL and older sister actually wants to get along with FL as well, so as of right now, we don't have to worry about that for now....