Lee Se Young is a South Korean actress managed by Prain TPC. She began her career as a child actress, starring in various movies and dramas such as Jewel in the Palace (2003), When I Turned Nine (2004), Lovely Rivals (2004) and The Wonder Years (2007).

Lee gained increased popularity after starring in the 2016 family series"The Gentlemen of Wolgyesu Tailor Shop", for which she won the "Best New Actress" award in the television category at the Baeksang Arts Award for her performance and Best Couple with her co-star Hyun Woo as were named as the “Achoo Couple” by fans. In 2017, Lee starred in her first leading role with KBS2's youth drama “Hit the Top”. In the same year, Lee starred in the fantasy romantic comedy drama A Korean Odyssey by the Hong sisters, and was praised for her portrayal of three different characters. In 2019, Lee starred in the tvN historical drama The Crowned Clown, based on the 2012 Korean historical film Masquerade, where she played the role of Queen Yoo So-woon. The same year, she appeared in the horror film Lingering and the medical drama Doctor John. In 2020, Lee starred in the mystery thriller Memorist as a genius profiler. She then reunited with Shin Sung-rok, whom she previously worked with in Trot Lovers, for the MBC drama Kairos In the 2021 MBC Drama Awards, Lee won the Top Excellence Actress award for her role in the historical romance series "The Red Sleeve", as well as the "Best Couple" award with Lee Jun Ho. In 2022, Lee made a special appearance as a cinema employee in the film Seoul Vibe. Lee also played the lead role as lawyer Kim Yu-ri in KBS romantic comedy drama The Law Cafe, reuniting with A Korean Odyssey co-star Lee Seung-gi.