Cheon Soo-yeon, better known by the stage name Song Ji-hyo (Korean: 송지효), is a South Korean actress and model. Song is one of the regular cast members of the South Korean variety show Running Man since 2010, which brought her international recognition. She was a cover model for Kiki Magazine before she made her acting debut in the feature film Wishing Stairs (2003), the third installment in the Whispering Corridors film series. She made her television debut in the romantic comedy Princess Hours (2006) and the historical Jumong (2006). Song then received wider recognition for her roles in the film A Frozen Flower (2008), New World (2013), the TV series Emergency Couple (2014) and Was It Love? (2020), and her first-ever film released after the start of the pandemic COVID-19 since March 2020 in South Korea, Intruder (2020), which received a positive response from moviegoers even though it was released during the pandemic.

Running Man (Korean: 런닝맨) is a South Korean variety show, formerly part of SBS' Good Sunday lineup. It first aired on July 11, 2010.