Oh Hye-rin, better known by her stage name Raina, is a South Korean singer. She is best known as a former member of the South Korean girl group After School and member of the 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".

After School (Korean: 애프터스쿨) is a South Korean girl group formed by Pledis Entertainment, with an admissions and graduation concept. As of 2023, the group's members are Raina, Nana, E-Young, Lizzy and Kaeun.