Seo Dan is a character in the K-drama "Crash Landing on You," portrayed by Seo Ji-Hye. She is the fiancée of Ri Jeong-hyeok, the main male lead, and is known for her confidence, determination, and ambition. Seo Dan comes from a wealthy family and is used to getting what she wants. However, her life takes a dramatic turn when she falls in love with Ri Jeong-hyeok, who is initially engaged to her. Seo Dan is characterized by her strong-willed nature and emotional depth. She starts off as a somewhat spoiled and self-centered individual but undergoes significant character development throughout the series. She learns to appreciate true love and selflessness, ultimately prioritizing the happiness of those she cares about over her own desires. **Character Arc:** Seo Dan's character arc is one of growth and transformation. Initially, she is portrayed as a privileged and somewhat entitled young woman who is determined to marry Ri Jeong-hyeok. However, as the series progresses, she faces various personal and emotional challenges that force her to reevaluate her priorities and understanding of love. Seo Dan's interactions with other characters, particularly Gu Seung-jun, play a crucial role in her development. She gradually sheds her superficial traits and becomes more empathetic and self-aware. By the end of the series, Seo Dan has matured into a compassionate and independent individual who values genuine connections and self-worth. Seo Dan's journey in the drama involves navigating complex relationships, dealing with her own insecurities, and finding her true self. Seo Dan's character adds a mix of romance, drama, and personal growth to the story, making her a memorable part of the series.