As Eun-hee delves deeper into the mystery of the ghostly presence in the washroom, she uncovers long-buried secrets and dark history tied to the school. She learns of a student named So-jin, who tragically died in the washroom years ago, and suspects that her spirit may be haunting the school.
Meanwhile, Ha-young and So-yeon continue to investigate the strange occurrences in the washroom, risking their own safety as they uncover the truth behind the ghostly presence. As they piece together the events leading up to So-jin's death, they realize that the past is not as it seems, and that the school's dark secrets may have played a role in her tragic fate.
As the three women come closer to uncovering the truth, they find themselves haunted by the ghostly presence and must confront their own fears and guilt. Eun-hee must come to terms with her own past and the role she unknowingly played in the events that led to So-jin's death, while Ha-young and So-yeon must confront the ghostly presence head-on in order to put an end to the haunting once and for all.
The Humming explores themes of guilt, redemption, and the power of forgiveness, as the characters must come to terms with their own pasts in order to move forward and find peace. As the mystery unravels, the truth behind the ghostly presence is revealed, leading to a chilling and cathartic conclusion.
