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|Portrayed by||Choi Ji-eun|
|Debut||episode 1: "The Hunting Party"|
Yoon-jin Song is a supporting character in the South Korean horror movie Cello (첼로 - 홍미주 일가 살인사건).
Within the movie, Yoon-jin is described as having symptoms of developmental disability ("발달장애증상이"). On the official website, she is described as an autistic child (자폐아).