Roh Yoon-seo is a South Korean actress and model. She is best known for her roles in the television series Our Blues (2022) and Crash Course in Romance (2023), as well as the films 20th Century Girl (2022) and Hear Me: Our Summer (2024). Her roles in Crash Course in Romance and Hear Me: Our Summer earned her multiple Best New Actress awards, and following the latter's success, she has been given the monicker "Nation's First Love".