Oh Hye-rin (born May 7, 1989), better known by her stage name Raina, is a South Korean singer-songwriter. She is the former main vocalist of South Korean girl group After School and also the former leader of After School sub-unit Orange Caramel. Raina debuted with the group in November 2009 following the release of the group's third single, "Because of You". She debuted as a solo singer in September 2014 with the single "You End, And Me".
Raina tried to audition with JYP Entertainment to become a rapper before joining Pledis Entertainment. Before debut, Raina was a barista at the Coffee Bean & Tea Leaf. She also previously auditioned for Mnet's Superstar K and was a student at the SM Academy. Raina is considered to be one of the best vocalists among idol girl groups in South Korea.
Raina officially debuted with After School for the release of their second single, "Because of You", which attained No. 1 on the Gaon Digital Chart and won the "triple crown" on SBS Inkigayo. She debuted with After School sub-unit Orange Caramel on June 18, 2010, on KBS Music Bank with the song "Magic Girl". She released her first solo single for the My Shining Girl OST in February 2012. Raina has written lyrics for Orange Caramel's "Still..." and "Standing in This Place". Raina also wrote the lyrics for After School's "Love Love Love" and "Timeless".