She was reborn in the war novel as the sister of the villain who had never shed blood nor tears.The ...
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I initially thought that the story might be fun only to realized that it's about borderline incest. I guess they're not blood related, but there has to be some moral issues when it comes to romancing your adoptive (not exactly but it's the best way to describe their situation) sibling
The reason why it's getting a lower score than a webtoon that basically had an abuser as a male lead is because that webtoon clearly shows how unhealthy that relationship was. This one doesn't seem to