Chinese film about a girl being kidnapped and raised in the kidnappers home

a baby was kidnapped and her mother paid the ransom and the kidnapper agreed to drop the baby off at the side of the road/ side of a car underground tunnel. the mother couldnt find her child there and tried to text the kidnapper but no reply. then the baby grows up to become a young adult in the kidnappers house while be tortured throughout. the girl then becomes desensitized to violence and eventually kills the kidnapper. theres also one particular scene i remember where she is lying on a couch and a fly lands on her eyeball but she doesnt flinch or anything. please help i have been searching for so long

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