My Sassy Girl is a 2001 South Korean romantic comedy film directed by Kwak Jae-yong, starring Jun Ji-hyun and Cha Tae-hyun. The film is based on a true story told in a series of blog posts written by Kim Ho-sik, who later adapted them into a fictional novel.

Wang Ji-hyun, known professionally as Jun Ji-hyun (전지현) or Gianna Jun, is a South Korean actress and model. She rose to fame with her role in the romantic comedy film My Sassy Girl (2001), which became a tremendous sensation across Asia and sparked an international breakthrough for Korean cinema. Other notable films include Il Mare (2000), Windstruck (2004), The Thieves (2012), The Berlin File (2013) and Assassination (2015). She also starred in the popular television series My Love from the Star (2013–2014) and The Legend of the Blue Sea (2016–2017), as well as the Netflix series Kingdom (2021).