Kim Yeon-du is often labeled a "red flag" character due to her manipulative tendencies and unpredictable behavior. She thrives on drama, using emotional turmoil to control those around her. Her inability to maintain healthy relationships, combined with a knack for deceit, makes her a cautionary figure. People are drawn to her charm but often find themselves ensnared in her web of chaos, leading to emotional turmoil and distrust. Ultimately, her actions serve as a reminder to recognize the signs of toxicity in friendship