Won Jin-ah (born March 29, 1991, in Cheonan, Chungcheongnam-do, South Korea) is a South Korean actress best known for her versatile performances in film and television. She made her screen debut in 2015 with short films and supporting roles in feature movies such as "The Chosen: Forbidden Cave" and "The Age of Shadows." Won's breakthrough came in 2017 when she landed the lead role in the drama series "Rain or Shine" (also known as "Just Between Lovers"), earning critical acclaim and a Best New Actress win at the APAN Star Awards.

Won Jin-ah's notable television credits include "Life" (2018), "Melting Me Softly" (2019), "She Would Never Know" (2021), "Hellbound" (2021), "Unicorn" (2022), "The Defects" (2025), and "Judge Lee Han-young" (2025). Her film work features prominent roles in "Steel Rain" (2017), "Money" (2019), "Long Live the King" (2019), "Voice" (2021), "A Year-End Medley" (2021), and "Secret: Untold Melody" (2025).