Lee Se-young is a South Korean actress. She debuted as a child actress in 1997 and was best known for her roles in Dae Jang Geum (2003), When I Turned Nine (2004), Lovely Rivals (2004), and The Wonder Years (2007). She is best known for her leading roles in The Crowned Clown (2019), The Red Sleeve (2021), The Law Cafe (2022), and The Story of Park's Marriage Contract (2023).