Park Sun-young (born August 12, 1993), known professionally as LUNA, is a South Korean singer, musical actress, and television presenter. She debuted as a member of girl group f(x) in September 2009, under SM Entertainment.

Apart from her group’s activities, she has established herself as an actress, notably through her participation in the original and Korean versions of stage musicals including Legally Blonde, Coyote Ugly, High School Musical on Stage!, School OZ Hologram Musical, In the Heights, Rebecca, Rudolf (The Last Kiss) and Autant en emporte le vent (Gone with The Wind). She also starred in the film The Lightning Man’s Secret.

She debuted as a solo artist with her debut mini-album, Free Somebody, on May 31, 2016, making her the second f(x) member to debut as a solo artist.

In 2022, LUNA made her Broadway Musical debut as MwE, the lead character from the musical KPOP.