A woman is attacked by Internet users after posting provocative remarks online. Using her personal information, they go to her place but what they find is her body; she took her own life. Who made her kill herself? Or, was she killed by someone else?

High school student Ha-Na experiences trouble sleeping after her classmate Jin-A committed suicide. Not being able to sleep, Ha-Na sees her parents fighting. The next day, her parents act like nothing happened the night before. She doesn't like her parents hypocritical behavior. Around this time, Se-Mi, a senior in the band club, approaches Ha-Na. Ha-Na begins to act differently, but she becomes to regret her behavior. A rumor spreads about her and she becomes the target of bullies.