Part 3/8:
As the story unfolds, Seo-yeon discovers a hidden room behind a wall in her house, filled with disturbing artifacts including a diary belonging to Young-sook. The new understanding of her connection to the girl from 1999 — a time when Seo-yeon had just lost her father — gets even more complicated when Young-sook reveals she is calling from the same house but years in the past.
The two women begin a frightening dialogue, sharing details from their respective lives and the lore of Young-sook's abusive stepmother who is trying to control her. Their conversations blur the line between past and present, making it evident that their realities intersect in dangerous ways. The horror escalates as Seo-yeon realizes that events from Young-sook's life could have ripple effects on her own existence.