yuriko

I believe the manhwa hasn't tell you much but in the novel (spoiler ahead)
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Fl's parents are incest so their family despise them

Oh wait it was told in the manhwa as well LOL I'm so forgetful

I don’t think it’s incest. I think her biological father had an affair with his wife’s sister ( female lead’s mom ).

Spoilers



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Lee Yeons biological father had an affair with his wife’s sister and got her pregnant.
Lee Yeon was born and was given up by her mother and left her with her now ‘adoptive’ mom who is actually her aunt.
She was looked down at and abused physically+emotionally by the aunt and her siblings/cousins for being an illegitimate child.

Father + Wife = already have children
Father + Sister in Law = have an affair and have Lee Yeon (LY)
Sister in Law = LYs mom but gives custody to her sister
Wife = LYs aunt who was given full custody

Older Siblings are her cousins as well