Synopsis: Incomplete Sisters

"Sister, we are each other's one and only 'sister', right?"Ryu So-hee is a high school student who was very sick as a child but has since recovered and now lives a normal life. She has a younger sister, Ryu Ah-young, who is currently ill. Although Ah-young is deeply attached to and follows her older sister, So-hee begins to find her presence increasingly suffocating. Triggered by a specific incident, a rift grows between them, and the two sisters start to feel intensely uncomfortable around one another.A cruel mystery thriller about two sisters, unfolding amidst a dark, hidden family secret!