Moon Sook, born Oh Kyung Sook, is a South Korean actress known for her 1970s movies. After 38 years, Moon Sook was persuaded by actress Han Hyo Joo to appear in the film "The Beauty Inside".
Moon was married to film director Lee Man Hui in 1974 till his death in 1975. Lee was 23 years older than Moon Sook. Her step-daughter is actress Lee Hye Young.