Cheon Seong-im (born 15 August 1981), better known by her stage name Song Ji-hyo is a South Korean actress and model. She first made her acting debut in Wishing Stairs (2003), one of the films in the Whispering Corridors film series. Her notable roles include being the ballerina Min Hyo-rin in the popular television series Princess Hours (2006), Lady Ye So-ya in Jumong (2007), the Queen in the movie A Frozen Flower (2008), Oh Jin-hee in Emergency Couple (2014), and Kim Soo-jin in Ex-Girlfriend Club (2015).
Song gained international fame for being the only female member of the popular Korean variety show Running Man, which made her popularity rise across Asia. Her frank, easy-going personality endeared her to many Korean and international fans.