Sun-mi leads a quiet, predictable life working at a public institution in Daegu, eating the same lunch each day. Her routine is disrupted when she receives an unexpected message, sparking her curiosity. On a Saturday morning, film director Ga-young holds a Q&A for her new movie, "The Murder at Cinema." Meanwhile, Eun-jung, a production line foreman, searches for Min-cheol, who has vanished with the company's financial records. She questions his contacts, eventually making her way to a cinema where he was known to frequent.