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If I remember correctly, from the novel, Weiwei said "your sister" when he was asking why Tongtong is still so clingy. Then Tongtong disagreed and said "Brother, not sister" or something along the lines. That's why Weiwei was giving off a disappointing look. It was as if Tongtong is still in denial that he has a sister, not a brother.
It's getting super complicated bcs the author keeps showing flashbacks bruh. The recent chapters are flashbacks of them after they bought the new apartment and I think it's unnecessary bcs we KNOW they fought a lot before the present time so there's really no need to show it?? It's not just the fact that we know they fought a lot back then but also bcs they're fighting over the SAME thing?? Idk this is just my opinion