Orphan Kate and John have been unable to extricate themselves from grief after the painful loss of their child who was not even born yet, and their marriage is facing a great test. At this time, Kate's mental condition is also deteriorating day by day. She has nightmares every night and is tormented by her past painful experiences. In order to live a peaceful and normal life, the two decide to adopt a child again. In the local orphanage, they both fall in love with an 8-year-old girl named Ace, so they adopted her. After Ace came to their home, a series of chilling horror events occurred inexplicably. These unpredictable events make Kate believe that Ace is definitely more than just an ordinary girl. She is not as cute as she looks. For the safety of her family, Kate wants to uncover Ace's mask by herself, but no one takes her words seriously. So, by the time the truth comes out, will it be too late?