Ideal Belly
Even if they aren't her biological parents, they raised her & treated her as their own, until Gu Wan returned, so they don't even care at all finding out she was kidnapped & almost died?
maybe they thought their real daughter is dead and Gu Chu can be considered as replacement. so when their real daughter is back, the replacement is not needed anymore.
haila2907:there might be some financial involvement that's why they would have shown her care n love