Something strange is happening when Su-mi and her younger sister, Su-yeon, come home to their father's large but dark and somewhat foreboding house after a stay in the hospital. Their dad is taciturn and burdened, and their stepmother, Eun-joo, greets them with forced enthusiasm and more than a little sense of irritation. But that's nothing compared to what happens when bedtime rolls around.

Originally produced as a motion picture. Special features: Commentary with director, cinematographer and lighting director ; Commentary with director and stars ; Original promotional footage ; Hidden feature: a letter from Su-yeon.