My Sin

Soyoung's life is shattered by a tragic accident in which she saves her eldest daughter, Nari, but loses the unborn child she was carrying. In the devastating aftermath, eight-year-old Nari begins exhibiting deeply unsettling behavior, eerily mimicking the dead sibling she never had the chance to meet. What starts as a strange quirk quickly escalates into a chilling mystery that threatens to tear the grieving family apart. Desperate for answers, Soyoung struggles to make sense of her daughter's transformation. Is this merely a psychological regression born from severe trauma, or has the spirit of her lost child truly returned by borrowing Nari's body? The ambiguity plunges Soyoung into an agonizing spiral of paranoia and grief, blurring the lines between maternal love and creeping dread. As Soyoung finds herself increasingly suspicious of her own daughter, she is forced to confront a terrifying internal reality. The more she doubts Nari, the closer she comes to facing a dark, monstrous truth hidden within herself—a horrifying realization and a depth of resentment that no mother should ever harbor toward her child.