The drama was based on the real life story of an exam paper leak case at a high school in Korea. It won many international awards including the Peabody Awards and the ABU TV Youth grand prize.A beautiful high school student, who is the top student of her class, mysteriously dies. Six of her friends who graduated from the same elementary school attempts to track down the reasons for her death by communicating in real time. While the six friends dig for the truth behind her death, they face difficulties in their studies, dropping out of school, bullying and boyfriend troubles.