A Tale of Two Sisters

Teenage girl Su-mi returns to her family's secluded country estate with her father, Moo-hyeon, and younger sister, Su-yeon. This marks the beginning of a complex family reunion filled with tension and unresolved emotional issues.

Upon their arrival, Su-mi and Su-yeon confront their stepmother, Eun-joo, whose mental health struggles cast a shadow over the family dynamics. The atmosphere is cold and distant, revealing the strains in Eun-joo's marriage to Moo-hyeon.

Su-mi and Eun-joo engage in several heated verbal clashes, showcasing their mutual disdain. Despite Su-mi's pleas about a wardrobe in Su-yeon's room, Moo-hyeon dismisses her concerns, further isolating Su-mi.

One troubling night, Su-yeon suffers a nightmare featuring the ghost of their deceased mother. Seeking comfort, she turns to Su-mi, illustrating the deep bond between the sisters in their time of distress.

The next day, Su-mi finds family photos revealing that Eun-joo was once their mother's nurse. This alarming revelation raises her suspicions about Eun-joo's involvement in Su-yeon's mysterious bruises, heightening the tension.

The family dynamic shifts dramatically during a dinner visit from their uncle Sun-kyu and aunt Mi-hee. Mi-hee's seizure leads her to claim she saw 'a girl' under the kitchen sink, adding an element of supernatural dread to the atmosphere.

Following Mi-hee's claims, Eun-joo investigates the kitchen sink only to be gripped by a ghostly presence when reaching for a hair clip. This occurrence indicates a deeper, haunting mystery affecting the household.

The relationship between Eun-joo and the sisters deteriorates further with the discovery of a dead bird and the vandalism of private photos. Eun-joo's suspicion leads her to lock Su-yeon in a wardrobe, intensifying the conflict.

In an explosive moment of confrontation, Moo-hyeon shockingly asserts that Su-yeon is dead, throwing Su-mi into emotional turmoil. This revelation solidifies the mental chaos lingering within the household.

Tensions peak when Su-mi sees Eun-joo dragging a bloodied sack, fueling her fears that it contains Su-yeon. A brutal fight erupts between Su-mi and Eun-joo, culminating in Su-mi losing consciousness.

As the narrative continues, it is revealed that only Su-mi and her father reside in the house. Su-mi struggles with dissociative identity disorder, where her troubled mind has created an illusion of Su-yeon's presence.

Despite the mounting tension, Eun-joo attempts to reconcile with Su-mi, promising to visit while trying to address their fractured relationship. However, Su-mi's rejection resonates deeply, highlighting the emotional scars they share.

Haunted by the tragic resonance of their past, Eun-joo is ultimately confronted by the spirit of Su-yeon. The lost girl's spirit emerges from the wardrobe, leading to a climactic and tragic end for Eun-joo.

In the aftermath of the chaos, Su-mi experiences a bittersweet moment of peace amidst her tears. This expression signifies a resolution to her inner turmoil, despite the heavy losses and emotional baggage she carries.

In a poignant flashback, the origin of Su-mi's trauma is revealed. A young Moo-hyeon’s affair with Eun-joo while their mother was alive leads to disastrous family conflicts, sealing the fates of Su-mi and Su-yeon.