Oh San-ha (오산하), born on October 2, 1983, is a South Korean actress. She began her career mainly in musical theater, debuting in 2006 with the well-known musical *Grease*. Her stage career was solidified with roles in highly successful productions such as *Jekyll & Hyde*, *The Three Musketeers*, and *Notre-Dame de Paris*, establishing her as a talented performer in the Korean musical scene. Alongside her work on stage, Oh San-ha has also appeared in television and film. One of her most notable television roles is that of Chae-kyeong in the highly popular 2009 historical drama *The Great Queen Seondeok*. Although her fame comes primarily from the theater, where she has received the most recognition from critics and the public, her ventures into television and film have helped diversify her filmography and introduce her to a broader audience.