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Ok so to make things easily said, LEGALLY they are siblings. some readers may have the idea that they already completely view each other as siblings because berry already calls her ‘sister’, but it’s quite common to call older or respected female friends unnie aka sister in Korea, so this doesn’t really make them sisters in itself. They literally just met and they are older so they could view each other as siblings eventually or just stay good friends who are legally tied. My thoughts are, it wouldnt be incest let alone immoral if Fl left the family, I personally don’t imagine this as an gl but u could see how it has an ok plot line for a gl. The argument the other person made for incest was that even if they hadn’t viewed each other as sisters, they still are legally sister, so yes it would be a strange gl if the Fl stayed in the family and fell in love with her sister. All in all, the person so mad about the technical aspect about the incest stuff is probably also someone who gets disgusted when an 18 and 17 year old date, legally it sounds like pedophilia but in actuality there’s only a year difference. Same as in actuality these girls don’t event know each other.