A single mistake can lead to hundreds of tragedies. On the eve of Soo Min’s big concert day, his university friends Won Ho, Seon Gi, Kim Hong and Jin Sook are gathering to celebrate this event. Talking about their old memories and having fun seems to be a happy moment. But soon Jin Sook begins a disturbing story about Soo Min who was sexually abused by her father and brother after her mother’s death. All the friends are shocked, and one by one they start talking about Soo Min’s secrets without realizing that she hears their conversation. This leads Soo Min to irrevocable revenge.