This drama is adapted from the comic of the same name. It tells the story of Midori, who has been in pure love since she was a student and married and has a happy family. She discovered that her husband had an extramarital affair for 15 years. She decided to take revenge on her husband and the mistress. As a revenge plan, Midori used the mistress's high school son. With her guilt towards him and unexpectedly boiling feelings, her husband's years of cheating plan began to be slowly exposed... The four-corner relationship of love and betrayal, what will be the new life of each of them in the future...