A series of murder cases happen in the company president Choe's family. At every scene of the murder, there is a black rose dropped on the spot. Investigators are anxious to find out what the black rose means. They get a clue by looking back on Choe's past. In the past, Choe tried to kill his friend Kim by pushing him off a cliff, and he even takes his wife to live with her. The investigation team closes the case by arresting Kim, who is alive and took his revenge.