@boag there is no way the mother gonna "use" her body again, that would be plain stupid for the author to return to the starting point with her development
About Rapist, i know that its korean manhwa thats why i wrote that normally his actions would be retarded as hell but in manhwa logic doesn't exist.
About Boram and Hana(is it Hana or Hyuna? don't remember) i think that compensated dating doesn't fit it since her punishment is selling her body so no way she was doing it before. I would say it might be some sort of accident, other option is bullying(popular plot in manhwa), also other one could be her being lured by some boy and gang raped that led to suicide.