After returning home, Seo Yeon stumbles upon an old phone and answers a call from a mysterious woman, Yeong Sook. Soon, she realizes they are living in the same house—but 20 years apart. What begins as an unusual friendship turns into a chilling nightmare when one small decision alters their fates in terrifying ways. As the past and present intertwine, Seo Yeon must face the consequences of changing time in this mind-bending, suspenseful thriller.
After returning home, Seo Yeon stumbles upon an old phone and answers a call from a mysterious woman, Yeong Sook. Soon, she realizes they are living in the same house—but 20 years apart. What begins as an unusual friendship turns into a chilling nightmare when one small decision alters their fates in terrifying ways. As the past and present intertwine, Seo Yeon must face the consequences of changing time in this mind-bending, suspenseful thriller.