Directed with a sure hand by Woo-Cheol Lee, this complex and suspenseful Korean horror thriller tells the story of Mi-ju, a virtuoso cellist who survives a brutal car accident and decides to spend more time with her family, becoming a music teacher. But just when her life seems to be in order, a series of eerie and alarming events--involving her mute daughter, a creepy new housekeeper, and a dangerously obsessed former student--makes it clear that all is not well.