Shin Haein. 

Reserved/Introverted: When first introduced on the train, she is usually quiet and keeps to herself, often with her guitar. Talented and Passionate: She is secretly the indie musician "Long Afternoon". This shows a passionate and creative side, dedicated to her music. Down-to-earth and Pragmatic: Fan discussions often describe her as a well-written character who feels very human, without the typical "miscommunication issues" or over-the-top drama found in some romance stories. Mature: She approaches situations with a level of maturity that helps the relationship with the male lead, Lee Yeowoon, progress in a more realistic manner. Private: She initially keeps her identity as a musician a secret, indicating a private nature.  that's all i know have fun 👍